SIM8950 module is a smart module newly released by SIMCom Wireless Solutions. It has Android operating system, the customers could use this module for the development of the hand devices.

The functions the module supports include LCM, touch panel, camera, audio, dual USIM, etc. For the fast understanding of the module’s characters, we developed an EVB （ SIM8950-EVB ） for customers. By operation of the EVB, the customers could complete the development and advanced research for SIM8950.

This document shows the usage of SIM8950-EVB, the users can get useful information about SIM8950 quickly through this document, and develop quickly and independently. This document applies to

SIM8950-EVB.

SIMCom supplies SIM8950-EVB for designers to develop applications based on SIM8950 module.

This EVB can test basic functionalities of the module.

1.1 Functional Block Diagram

The following figure shows block diagram of SIM8950 EVB.

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Figure 1: SIM8950-EVB Functional Block Diagram

SIM8950-EVB device include of three parts :

EVB board 、 SIM8950 TE board and PMI board(optional).

The device has fool-proof design, The EVB’s assembly as following: www.simcom.com

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Figure 2: EVB assembly picture

1.2 Key Features

Table 1: Key Features

Funtion Part Interface

Power Supply

SIM8950 EVB www.simcom.com

LCM interface

Touch Panel Interface

USB interface

Audio interface - input

Description

●DC power input :4.8V~6V(Typ.:5V)

●VBAT Connector:3.4V~4.4V(Typ.:3.8V)

●LCM : 2*25PIN ZIF connector interface LCM_0 & LCM_1

●HDMI

●LVDS two capacitive touch panel

Type-C and micro USB interface （ selected by switch ）

Support USB OTG

Handset MIC1

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SIM8950-EVB Kit_User Guide_V1.02

Audio interface - output

USIM interface

SD Card Interface

UART Interface

Buttons

Indicated LED

FLASH LED sensor

RTC others

Earphone MIC2

Denoising MIC3

Receiver ： EAR_P ， EAR_N

Headset ： HPH_R ， HPH_L

Speaker ：

 SIM8950 internal class-D: SPK_N ， SPK_P

（ 1.5W/4ohm/5V ）

 SIM8950 PIN LINEOUT_P ， LINEOUT_N: an external audio PA on EVB

Support USIM/SIM cards: 1.8V and 2.95V

Support dual SIM dual standby

Hot-plug detection

Support 4-bit SD card with hot-plug detection

CP2105 USB to UART supports 2 UART ports

An enhanced COM port

A standard COM port

Power Key

VOL_up

VOL_down

LED101

An external FLASH LED driver

Supports Flash LED mode and Torch mode.

PS/ALS sensor

G-sensor

Yes

TE connectors

PMI connectors

Camera

Antenna

Forced USB boot

Power test point

21M main camera and 8M front camera

Main antenna

Diverse antenna

BT/WIFI antenna

GPS antenna

Forced_USB_BOOT and VREG_L5_1V8 test point

VBAT and GND test points

Input range ： 3.4V~4.4V(typical:3.8V)

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PMI （ optional ） charging

Fuel gauge

Type-C OTG

LCM backlight driver

FLASH LED driver

Vibrator

Support Qualcomm Quick Charge 2.0&3.0

The max. charging current: 3A support

VBUS_USB_IN supports OTG 5V output （ 1A ）

Supports 4 strings 7 parallel LEDs

WLED_A max.28V

30mA supply current of every WLED_SINK

1A@Flash mode, 200mA@Torch mode

Support

1.3Interface Overviews

www.simcom.com

Figure 3 ： EVB functional blocks introduction （一）

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Figure 4 ： EVB functional blocks introduction （二） www.simcom.com

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www.simcom.com

Figure 5 ： EVB functional blocks introduction （三）

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www.simcom.com

Figure 6 ： SIM8950 EVB TOP positions

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Figure 7 ： SIM8950 EVB Bottom positions

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Table 2: Interfaces of SIM8950 EVB

Interface

DC5V adapter

VBAT

Power switch

PWRKEY

VOL_UP

VOL_DOWN

USB Switch

USB interface

Audio interface

USIM interface

UART interface

SD card interface

LED

Flash LED

LCM and Touch Panel

HDMI interface

LVDS interface

Sensor

Vibrator

TE connectors

PM connector

Coin Cell

EVB position

J102

J103

S101

J511

LED101

LED421

J201 J202

J203 J204

J900

J901

U421

U422

J704

S421

S423

S422

S621

J621

J622

J302

J304

J301

U511

U512

J512

J701, J702

J703

B701

Description

Typ. Voltage: 5.0V

Battery connector

5V on/off switch

Power key

Volume +

Volume -

MICRO USB/Type-C USB switch

Type-C USB interface

Micro USB interface

Speaker

Headset

Handle

USIM1 connector

USIM2 connector

USB to UART connector

SD card connector

Power on

Camera LED

LCM ZIF connector

TP ZIF connector

HDMI connector

LVDS test point

G-sensor

PS/ASL sensor

Motor

TE board connectors

PMI8952 board connector

RTC function www.simcom.com

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1.4SIM8950 EVB Kit Accessories

All accessories of the SIM8950 EVB kit are listed as below. Please contact the supplier if there is something missing.

www.simcom.com

Figure 8: SIM8950 EVB Kit Accessories

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Table 3: Accessories List

Items Description

Adapter

Cables

Antennas

Cameras

DC 5V Output

USB cable

USB to UART converter cable

RF cables

Main/Diversity antennas

Wi-Fi antenna

GNSS antenna (active)

Rear Camera Module

Front Camera Module

Quantity

1 www.simcom.com

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2Interface Applications

This chapter describes the hardware interfaces of SIM8950 EVB, shown as follows:

● Power supply interfaces

● EVB output power net

● TE-Connector interface

● LCM interface

● Touch panel interface

● Camera interfaces

● USB interfaces

● Audio interfaces

● USIM interfaces

● UART interface

● SD card interface

It also provides information about flashlight, sensors, vibrator, buttons, status indication LED and test points to help customers use the SIM8950 EVB.

2.1Power Supply Input Interface (J102, J103)

There are two power supply methods for SIM8950-EVB: www.simcom.com

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Figure 9 ： Power Block Diagram

Method 1 ----5V adapter ：

It is powered by a 5V adapter from J102, which is powered down by the LDO U101 to 4.2V to supply power to the SIM8950 module. When the adapter is used for power supply, the switch S101 needs to be switched to ON to ensure the conduction of the path. The S101 Switch is used to turn on/off the power.

Method 2 ----Battery ：

The module is powered by the battery 3.5V-4.4V: In order to prevent the adapter and the battery from being connected at the same time, the MOS control (Q104) is added to the battery power supply path. When the adapter is inserted, the MOS (Q104) disconnects the battery powered by.

S101 is Power ON/OFF Switch, ： www.simcom.com

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Figure 10 ： EVB Power distribution

NOTE

In order to facilitate the user to test the current consumption of the module, the VBAT and GND test points are added on the TE Board. Customers can test the power consumption of the module by powering the VBAT test point independently, and disconnecting the J104 & R118.

The priority selection of EVB adapter or battery power supply is as follows, when battery and DC adapter connected meantime, system use DC adapter priority: www.simcom.com

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Figure 11: Power Supply Diagram of battery connector

NOTE

Charging function only supported by PMI8952 board, you can do charging test use SIM8950 EVB +

PMI8952.

Both micro USB and type-c can be used for charging. Do not use them at the same time.

The following table shows the pin definition of battery connector.

Table 4: Pin Definition of Battery Interface

Pin No.

Pin Name

VBAT

THERM

GND

Description

Power input pins.

Connect to the positive pole of the battery.

Used for battery temperature detection.

A 47K thermistor is used for the battery protection circuit.

Ground pins.

Connected to the negative pole of the battery.

2.2EVB output Power net

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The peripherals on SIM8950-EVB mainly supported by module internal power, the output power net as following table ：

Table 5: The power distribution for peripherals

Function position

LCM J201,J202

BL driver IC

Touch Panel

Flash LED driver IC

G-SENSOR

PS/ALS sensor

T-flash

SIM card

U202,U203

J203,J204

U423

U421

U422

J511

U511

Source

LDO6_1P8(10pin) ， LDO17_2P85(5pin)

VPH_PWR

LDO10_2P8(6pin) ， LDO5_1P8(12pin)

VPH_PWR

LDO6_1P8(7pin), LDO10_2P8(6pin)

VPH_PWR 、 LDO10_2P8(6pin), LDO6_1P8(10pin)

LDO11_SD(149pin),LDO5_1P8(12pin)

LDO14_UIM1(211pin) 、 LDO15_UIM2(172pin)

The power distribution diagram shown as following ：

Figure 12: The power distribution for peripherals

2.3TE Interface (J801, J802)

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The TE interface includes two B2B connectors named J801 and J802.The TE board is connected to the

EVB via the two connectors. SIM8950 module is soldering on TE board.

The following figure shows the two B2B connectors positions:

Figure 13: B2B Connectors

2.4Display

SIM8950-EVB provides two LCM （ J201 J202 ） with MIPI interface, and HDMI/LDVS （ J900/J901 ） output.

Different functions need different software versions.

MIPI-DSI0 divided into two path by a MIPI-Switch, one path for LCM0, the other is connected to a HDMI transfer IC LT8912B, the diagram shown as below ： www.simcom.com

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Figure 14: Display Part Block Diagram

2.4.1 LCM Interface

The SIM8950 EVB provides a LCM interface and can be equipped with a LCD module. Currently the

SIM8950 EVB provides a 5.5-inch 1440 × 720 HD resolution liquid crystal display.

The LCM’s pin definition as following diagram: www.simcom.com

Figure 15: Reference Design for Main LCM Interface

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2.4.2 Backlight Driver for LCM interface

The SIM8950 EVB uses a PWM dimming step-up LED driver for the WLED backlighting of LCM interface.

The following figure shows a reference circuit design for the backlight driver.

Figure 16: Reference Design for Backlight Driver

2.4.3 HDMI/LVDS interface

SIM8950 EVB have HDMI/LVDS display interface ， U801 is a MIPI to HDMI/LVDS transfer IC, it transfer

DSI0 to two path ， one signals for LCM interface , the other is for HDMI interface.

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Figure 17: MIPI to HDMI/LVDS switch

NOTE

1, Please check that R801 is soldering and R802 is NC, HPD_CONN is recommended to control the

SEL pin.

2, HDMI 、 LVDS 、 LCM_0 cannot use at the same time. Different functions need different software versions

Table 6: LVDS pin definitions

Signal

VDD

GND

LVDS_D0_N

LVDS_D0_P

LVDS_D1_N

LVDS_D1_P

LVDS_D2_N

LVDS_D2_P

GND

LVDS_CK_N

LVDS_CK_P

LVDS_D3_N

LVDS_D3_P www.simcom.com

Figure 18: HDMI & LVDS Connector

Description

Power Supply for LVDS display

No Connection

Ground

LVDS Data Lane-0 Positive

LVDS Data Lane-0 Negative

LVDS Data Lane-1 Positive

LVDS Data Lane-1 Negative

LVDS Data Lane-2 Positive

LVDS Data Lane-2 Negative

Ground

LVDS Clock Lane Positive

LVDS Clock Lane Negative

LVDS Data Lane-3 Positive

LVDS Data Lane-3 Negative

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2.5Touch Panel Interface

The SIM8950 EVB provides a touch panel interfaces: J203, J204.

J203 and J204 are two 6-Pin ZIF connectors ， The following figure shows a reference design for touch panel interfaces.

Figure 19: Reference Design for Touch Panel Interfaces

Table 7: Pin Definition of Touch Panel Interfaces

Pin No.

Pin Name Description

GND GND

TP_RST Reset signal of touch panel

TP_I2C_SCL I2C clock signal of touch panel

TP_I2C_SDA I2C data signal of touch panel

TP_INT Interrupt signal of touch panel

VDD 2.85V power supply for touch panel VDD power

Comment

Active low www.simcom.com

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2.6Camera Interfaces

SIM8950 EVB provides two camera interfaces (2-lane+1-lane) with rear camera and front camera assembled.

● The rear camera uses a 21M pixels digital CMOS sensor with auto-focusing function.

● The front camera uses a 8M pixels digitals CMOS sensor with auto-focusing function.

The following figure shows the camera interfaces with cameras assembled.

Figure 20: Camera Interfaces with Cameras Assembled www.simcom.com

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The following figure shows a reference design for camera interfaces.

www.simcom.com

Figure 21: Reference Design for two Camera Interface

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2.7USB Interfaces

SIM8950-EVB support two types of USB interface, type-c and micro USB.

A SPDT switch S621 is used for USB_HS selection. Switch to MIRCO side for micro USB, and switch to

TYPE-C side for USB type-c.

Support USB OTG ， an external boost on EVB output 5V/1A for VBUS.

Figure 22: USB selection and connection www.simcom.com

Figure 23: USB related components position

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The following figure shows a reference circuit design for USB interfaces.

Figure 24: Reference Design for USB Interfaces

2.8Audio Interfaces

SIM8950 EVB provides three analog audio interface including :

 Speaker (J302)

Path 1: SIM8950 module internal Class-D audio PA output(SPK_P,SPK_N), 1.5W/4Ω.

Path 2: An external class-AB audio PA (U301) on EVB.

 Headset (J304)

3.5mm 4-segment earphone on EVB, Support both OMTP and CTIA standard.

 Handle (J301) standard 4-wire interface; supports main MIC and handset functions www.simcom.com

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2.8.1 Loudspeaker Interface

SIM8950 EVB provides one loudspeaker interface. The following figure shows the speaker’s design:

Figure 25: Reference Design for Loudspeaker Interface

NOTE

The default design is use the SIM8950’s internal audio PA: SPK _P(16pin) and SPK _N(17pin).

If external PA path need to test, please remove B307 & B308, and soldering B304 & B306.

The two path cannot use at the same time, and need software support.

The following picture show the bead position of the two path: www.simcom.com

Figure 26: jumper-bead of speaker

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2.8.2 Headset Interface

3.5mm 4-segment earphone on EVB, Support both OMTP and CTIA standard.

CTIA is the default standard, you can choose the standard by set R321 and R322 with different value.

Table 8: Standard set

R321

0ohm

R322

0ohm

standard

CTIA

OMTP

Figure 27: Position of R321 and R322

When the headset is inserted, there will be an interrupt （ HS_DET=0 ） to the module which can make the module enter the headset mode.

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2.8.3 Handle

In the hands-free mode, the MIC used the handset MIC(MIC1_P/N), Analog output switched to the EVB speaker(SPK_P/N) and receiver(EAR_P/N) interface.

SIM8950 EVB provides one receiver interface. The following figure shows a reference circuit design for receiver interface.

Figure 28: Reference Design for Earphone Interface

SIM8950 EVB provides one differential microphone inputs for microphone interfaces. The differential microphone input is for ECM-Type microphone. The following figures show a reference circuit design for microphone interfaces.

www.simcom.com

Figure 29: EMC microphone reference circuit

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Figure 30: Handle Interface

Table 9: Pin Definition of Handle Interface

Pin No.

Pin Name Function

MIC_GND

EAR_N

EAR_P

MIC1P

Dedicated GND for audio

Earpiece output, negative

Earpiece output, positive

Microphone input

NOTE

1. Internal MIC_BIAS pull-up is used to reduce BOM cost and PCB routing.

2. Single-ended capless input is the only supported configuration, but differential routing is recommended.

2.9USIM Interfaces

The SIM8950 EVB provides two USIM card (2.95V or 1.8V) connectors U511(USIM1 card connector) and

U512 (USIM2 card connector).

Support hot-plug detect.

The following figure shows the reference design.

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Figure 31: Reference Design for USIM Card Interface

The following figure shows the pin assignment of USIM1 card connector (U511).

Table 10: Pin Definition of USIM Card Connector

Pin No.

Pin Name Function

CD1

CD2

USIM_VDD

USIM_RST

USIM_CLK

GND

VPP

USIM_DATA

GND

USIM_DET

USIM Power supply

USIM Reset signal

USIM Clock signal

GND

USIM data signal

GND

USIM detect signal

2.10 UART Interfaces

SIM8950-EVB includes one USB （ J512 ） to dual UART Bridge as shown in the following figure. Users can get the serial log via debug UART, which is shown as ‘Standard COM Port’ on PC’s COM port list.

Enhanced COM Port support hardware flow control ， connected to SIM8950 UART4 （ PIN38/39/182/183 ） .

Standard COM Port is standard 3-line UART port ， connected to SIM8950 UART2 （ PIN36/37 ） www.simcom.com

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Standard COM Port

Enhanced COM Port

UART4

Debug UART

Figure 32: USB to UART Bridge www.simcom.com

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2.11 SD Card Interface

SIM8950 EVB provides an SD card interface J511 for customers to test the module’s SD card interface.

The following figure shows the simplified interface schematic for SD card interface on SIM8950 EVB.

Figure 33: SD card reference circuit

NOTE

SD_DET signal pulled up to VREG_L5_1V8, Low active.

2.12 Sensors

SIM8950 EVB provides two sensors for testing purpose, PS/ALS sensor U422 and G-sensor U421 。

Table 11: information of sensor on EVB

Sensor

PS/ALS U422

G-sensor U421

Part number

CM36682M3OE

BMI120

Vendor

CAPELLA

BOSCH

2.13 Vibrator

SIM8950 EVB provides a vibrator interface. But motor driver function is on the PMI8952 board. Install

PMI board if you need to test the motor driver interface.

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2.14 Buttons

There are 3 keys total on the EVB board, Powerkey 、 VOL_UP and VOL_down.

The locations are as in the following figure:

Figure 34: Buttons

Press PWRKEY and VOL + / VOL- in combination to have specific functions, as shown in the table below ：

Table 12: PWRKEY / VOL + / VOL key combination

PIN NO.

PWRKEY VOL+

Key combination before starting

VOL-

Function

Enter forced download mode

Enter engineering mode

After the customer connects the power supply and the module correctly, press the power button until the screen displays normally, then release the button to start the computer normally

2.15 Flash LED421

There is a Flash LED driver IC U423 to drive a flash LED421 on EVB board. LED421 can used for camera flash mode or torch mode.

The driver circuit shown as below.

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Figure 35: Flash LED circuit

NOTE

PMI8952 board has Flash_LED function ， it can drive the flash LED directly.

If customers need to test the Flash function on PMI8952, just remove R438, and soldering R437.

2.16 PMI interface

PMI8952 board is always used with SIM8950 module, it has some extend functions as below:

 Charging

 LCM backlight driver

 Flash led driver

 USB Type-C

 Motor driver

 USB OTG 5V output www.simcom.com

Figure 36: PMI8952 board

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2.17 Forced USB BOOT Interface

FORCED_USB_BOOT is the emergency download interface.

FORCED_USB_BOOT is pulled up to LDO5_1P8, and the module can enter the emergency download mode. Used when the product does not start properly. To facilitate subsequent software upgrades and debugging, please reserve test points.

Table 13: FORCED USB BOOT definitions

Pin Name

FORCED_USB_BOOT

I/O

LDO5 _1P8 PO

Description

USB forced download signal, short-circuit to

LDO5_1P8 at power-on to enter forced download mode.

1.8V power supply of GPIO port, normally open, voltage is not adjustable

Note

Figure 37: Emergency download reference circuit

The test points of FORCED_USB_BOOT and LDO5_1P8 are on the TE board, Short the two test point of

S100, SIM8959 module enter forced boot mode after power on.

The test points(S100) position as following picture: www.simcom.com

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Figure 38: Emergency download www.simcom.com

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3 Operation Procedures llustration

This chapter introduces how to use the SIM8950 EVB for testing and evaluating SIM8950 module.

3.1 Power ON Smart Modules

The following are the procedures for powering on the smart module.

1. Connect the TE board to the connectors (J701 and J702) on SIM8950 EVB.

2. Install a Li-polymer battery on J103 ， or 5.0V DC adapter plug in J102.

3. Switch S101 to ON side,then LED101 will be lighted.

4. Press S421 (PWRKEY) for at least 2s to turn on the module. When the following interface is displayed on the utilized LCD, it means the booting has been completed.

Figure 39: LCD Display Indicating Module’s Power-on

NOTE

Inserting USB cable into USB interface after power supply is provided can also turn on the module www.simcom.com

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3.2 Communication Via USB or UART Interface

3.2.1 Communication via USB Interface

1. Power on the module according to the procedures mentioned in Chapter 4.1.

2. Connect SIM8950 EVB and the PC with USB cable through USB interface and install the USB driver and

ADB driver. The USB port numbers can be viewed through the PC’s Device Manager, shown as below.

Figure 40: USB COM Ports

3. Open CMD tool: “ START ” “ All Programs ” “ Accessory ” “ Command Prompt ”.

4. Use the “ adb shell ” command to make the module enter into ADB mode. Then customers can use USB

ADB interface for test.

www.simcom.com

Figure 41: “adb shell” Command

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3.2.2 Communication via UART Interface

1. Connect the UART interface (J512) to the PC and then power on the module according to the procedures mentioned in Chapter 5.1.

2. Install the USB-to-RS232 driver. After that, the USB serial port number can be viewed through the PC

Device Manager, shown as the following figure.

Enhanced COM port supports hardware flow control.

Standard COM port is a 3-line UART port.

Figure 42: USB Serial Port

SIMCom provides a serial port tool(SIMCom Serial Port Tool) for customer to test module through AT

Commands. Serial Port Tool can communicate with modules after opening COM Ports on list. On following figure, every section of serial tool can be seen.

www.simcom.com

Figure 43: SIMCom Serial Port Tool Introduction

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Also, SIMCom Serial Port Tool may take some log records and save these command list to use later again.

Tool has a 3 CMD List sections and holds AT Commands with their notes and saves under .ini format on PC to import it back.

3.3Firmware Upgrade

SIMCOM modules upgrade firmware via USB port by default. Please follow the procedures below to upgrade firmware.

1. Install and open the firmware upgrade tool QFIL on PC and then power on the smart module according to the procedures mentioned in Chapter 4.1.

2. Click the “ SelectPort ” and select the USB port “ Qualcomm HS-USB QDLoader 9008 (COM36) ”.

3. Select “ Flat Build ” in “ Select Build Type ” option.

4. Click “ Browse ” to select the firmware which needs to be upgraded in “ Select Programmer ” option.

5. Click “ Load XML ” to select the XML which needs to be upgraded in “ Select Build ” option.

6. Click “ Download ” to upgrade the firmware.

www.simcom.com

Figure 44: Firmware Upgrade Steps

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3.4Power OFF Smart Modules

There are two methods to power off the module.

The steps for the first method are as follows:

1. Press S421 (PWRKEY) for at least 1s under the power-on state of the module, and then LCD will display a menu for selection

Figure 45: LCD Display Indicating Module’s Power-off

2. Choose “ Power off ” option.

3. The module will be powered off normally.

The other method is to press down PWRKEY for at least 8s until the module is shut down completely www.simcom.com

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4 Appendix

4.1References

Table 14: Related Documents

SN

[1]

Document name

SIM8950_Hardware_Design

Remark

SIM8950 series hardware design

4.2Terms and Abbreviations

Abbreviation

PWM

UART

USB

USIM

WLED

ZIF

ALS

CMOS

ECM

SIM8950 EVB

LCM

LED

MEMS

MIPI

OTG

Table 15: Terms and Abbreviations

Description

Ambient Light Sensor

Complementary Metal Oxide Semiconductor

Electret Microphone

SIM8950 Evaluation Board

LCD Module

Light Emitting Diode

Micro-Electro-Mechanical System

Mobile Industry Processor Interface

Not Connected

On-The-Go

Personal Computer

Proximity Sensor

Pulse Width Modulation

Universal Asynchronous Receiver & Transmitter

Universal Serial Bus

(Universal) Subscriber Identity Module

White LED

Zero Insert Force www.simcom.com

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SIM8950-EVB Kit_User Guide_V1.02

4.3Safety Information

The following safety precautions must be observed during all phases of operation, such as usage, service or repair of any cellular terminal or mobile incorporating SIM8950 module. Manufacturers of the cellular terminal should send the following safety information to customs and operating personnel, and incorporate these guidelines into all manuals supplied with the product. If not so, SIMCom assumes no liability for customers’ failure to comply with these precautions.

Table 16: Safety Caution

Marks Requirements

When in a hospital or other health care facility, observe the restrictions about the use of mobiles. Switch the cellular terminal or mobile off, medical equipment may be sensitive and not operate normally due to RF energy interference.

Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it is switched off. The operation of wireless appliances in an aircraft is forbidden to prevent interference with communication systems. Forgetting to think much of these instructions may impact the flight safety, or offend local legal action, or both.

Do not operate the cellular terminal or mobile in the presence of flammable gases or fumes. Switch off the cellular terminal when you are near petrol stations, fuel depots, chemical plants or where blasting operations are in progress. Operation of any electrical equipment in potentially explosive atmospheres can constitute a safety hazard.

Your cellular terminal or mobile receives and transmits radio frequency energy while switched on. RF interference can occur if it is used close to TV sets, radios, computers or other electric equipment.

Road safety comes first! Do not use a hand-held cellular terminal or mobile when driving a vehicle, unless it is securely mounted in a holder for hands free operation.

Before making a call with a hand-held terminal or mobile, park the vehicle.

GSM cellular terminals or mobiles operate over radio frequency signals and cellular networks and cannot be guaranteed to connect in all conditions, especially with a mobile fee or an invalid SIM card. While you are in this condition and need emergent help, please remember to use emergency calls. In order to make or receive calls, the cellular terminal or mobile must be switched on and in a service area with adequate cellular signal strength.

Some networks do not allow for emergency call if certain network services or phone features are in use (e.g. lock functions, fixed dialing etc.). You may have to deactivate those features before you can make an emergency call.

Also, some networks require that a valid SIM card be properly inserted in the cellular terminal or mobile.

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