MOBITEK S80 3G Modem — Send SMS via API and Connect to 3G Network at the Same Time


Many 3G modems allow you to send SMS via API or connect to 3G network but not both at the same time



MOBITEK® S80 it is a SMS modem and also a 3G modem.

MOBITEK® S80 allows you to do both at the same time — to send SMS via API and connect to your IoT server, cloud server (AWS, Azure) and web server via 3G network.

The pictures below show that MOBITEK S80 is connected to (internet) via U Mobile 3G network and at the same time, is able to send out SMS via MOBITEK SMS API.

MOBITEK S80 SMS Modem to Use SMS API and to Access Internet via 3G-03AirCard Watcher-05


More Information


How to Configure MOBITEK S80 SMS Modem to Use SMS API and to Access Internet via 3G at the Same Time

  1. Goto “AirCard Watcher -> Setting -> Messaging -> Routing option”  and select  “Circuit Switched”.
    MOBITEK S80 SMS Modem to Use SMS API and to Access Internet via 3G-01
    MOBITEK S80 SMS Modem to Use SMS API and to Access Internet via 3G-02
  2. After you have set to “Circuit Switched”, you can use MOBITEK SMS API and access internet via 3G at the same time.
    MOBITEK S80 SMS Modem to Use SMS API and to Access Internet via 3G-03
  3. Note that AirCard Watcher (through Sierra Wireless AirCard HSDPA Modem) uses different COM port, in this example, it is using COM port number 3.
    MOBITEK S80 SMS Modem to Use SMS API and to Access Internet via 3G-04


How to Use AirCard Watcher to Connect MOBITEK S80 3G Modem to 3G Network

  1. First, install AirCard Watcher.
  2. Insert SIM card into MOBITEK S80 3G Modem and connect it to PC or laptop.
  3. A new modem in “Device Manager” will appear — “Sierra Wireless AirCard HSDPA Modem”.
    AirCard Watcher-01
  4. Run AirCard Watcher.
    AirCard Watcher-02
  5. AirCard Watcher will automatically detect the MOBITEK S80 3G Modem and show the name of TELCO. In this example, it is “U Mobile”. It will also show “3G”.
    AirCard Watcher-03
  6. Click “Connect” button to connect to 3G network. If successfully connected then the red signal bar will turn to green and the “Connect” button will change to “Disconnect”.
    AirCard Watcher-04
  7. Try accessing the internet via a web browser. AirCard Watcher will show the upload and download speed (refer to red box).
    AirCard Watcher-05
  8. To check data usage, click on the “meter” icon (red box)
    AirCard Watcher-06

USB Driver of MOBITEK S80 Supports Windows Server 2008, Windows Server 2012, Windows Server 2016 and Windows 10

We have conducted a test in 4 different OS which is:-

  • Windows Server 2008 32-bit;
  • Windows Server 2012 64-bit;
  • Windows Server 2016 64-bit; and
  • Windows 10 64-bit.

Then we left MOBITEK S80 running for 4 hours in each OS, and the COM Port DID NOT disappear.

MOBITEK S80 was not connected to power cable, it is using power from the USB cable.

The USB driver version is 11.5.


 Windows 2008 32-bit No  

 Windows 2012 64-bit No  

 Windows 2016 64-bit No  

 Windows 10 64-bit No  

Therefore the USB driver, version 11.5, for MOBITEK S80 works in these 4 OS:-

    • Windows Server 2008 32-bit;
    • Windows Server 2012 64-bit;
    • Windows Server 2016 64-bit and
    • Windows 10 64-bit.

MOBITEK S80 is 99% Compatible with Sierra Wireless FX100

Sierra Wireless FX100 3G Modem has reached end-of-life production cycle. It may be difficult to obtain a new unit. The good news is that  MOBITEK®  S80 is 99% compatible with Sierra Wireless FX100 3G Modem.

SPECIFICATION MOBITEK-S80_backMOBITEK S80 Sierra Wireless FX100Sierra Wireless FX100
SL8082T Module Yes Yes
GSM (2G) Network Quad Band Yes Yes
GPRS Network Yes Yes
WCDMA (3G) Network Dual Band Yes Yes
Serial Port (RS-232) 15-pin Yes Yes
USB Port Yes Yes
Sierra Wireless USB Driver Yes Yes
Open AT Yes Yes
GPS No Yes
Voice Yes Yes

More Information


Fail-Over to 3G Network When Landline Fails


If your clients have mission critical applications that requires uninterrupted internet connection and your client’s landline (Unify or Streamyx) goes down.



MOBITEK F3427 allows uninterrupted internet access via 3G network in case Unify or Streamyx service goes down.

Fail-Over to 3G Network When Landline Fails

MOBITEK F3427 enables all your devices, computers, laptops in LAN to continue to have internet access via 3G network.

  1. insert 3G SIM card into MOBITEK F3427; and
  2. connect MOBITEK F3427 to your swtich (NOT router)


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How to Set-Up Sierra Wireless GL6110 GSM Modem

  1. Connect the antenna to the modem
  2. Connect the power adapter to the modem.
  3. Plug in the power adapter, turn on power
  4. Insert the SIM card, modem green LED will blink.GL6110-setup-04
  5. Attach serial Cable to modem and the other end to the USB-to-serial converter.
  6. Plug the USB cable into the USB port of the PC.
    The USB driver is the same as MOBITEK Q24 Modem.

How to Install MOBITEK Q24 GSM Modem Hub’s USB Driver in Linux

This guide applies to the following MOBITEK products:-

  • MOBITEK Q24 GSM Modem
  • MOBITEK Q24 GSM Modem Hub

USB Driver had been pre-installed in the following Linux Distro:-

  • Ubuntu 11.10 and above
  • Any distro based on Ubuntu 11.10 and above such as Linux Mint

For other distro, you may need to compile the driver into Linux kernel which is not covered in this guide.


  1. Optional — install “Cutecom” from Software Manager.

    Linux_USB-01Click on “install”
  2.  Go to “User and Groups”.
  3.  Click on the current user and then click on “Groups”.
  4.  Assign the following “Groups” or permissions to the user:-
    1.  dialout
    2.  root
    3.  sudo
    4. tty
  5.  Restart Linux.
  6.  Open terminal and enter “lsusb”.
  7. If MOBITEK Q24 GSM Modem Hub is detected by Linux, there should be 2 items listed on screen — “Future Technology Devices International, Ltd FT4232H”.
  8.  Open CuteCom (or minicom).
  9.  Manually type “/dev/ttyUSB0”
  10. Click on “Open device”.
  11. For the input method below, change the Input type from “LF line end” (default) to “CR,LF line end”.
  12.  Enter “AT”, and if “OK” is returned or displayed then this mean that the modem is successfully connected to “/dev/ttyUSB0”.
  13. Click “Close device”.
  14. To check next modem in MOBITEK Q24 GSM Modem Hub, then type:-
    1. /dev/ttyUSB1
    2. /dev/ttyUSB2
    3. /dev/ttyUSB7
      and repeat Step 10 until 13.

How to Insert SIM Card

(note: for updated post, please refer to

  1. Before you insert the SIM card into your Modem, you must check the position of SIM Card.
    – MOBITEK MobiGATE or MOBITEK Q24 STK MODEM HUBHow to Insert SIM Card-01
    – The correct position of SIM Card to be inserted:How to Insert SIM Card-02
  2. When insert the SIM Card:-
    – the “gold area” of the SIM Card should be facing at down position;
    – turn on the switch button, you can see the blue LED Blinking which means your modem is connected. to the GSM/3G network

Applies To

  • MOBITEK MobiGATE, Model: SG-B-8-L-W
  • MOBITEK MobiGATE, Model: SG-B-8-U
  • MOBITEK Q24 STK Modem Hub, Model: B-8-U
  • MOBITEK Q24 GSM Modem Hub, Model: B-8-U