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I have a few questions related to GPRS/GSM SIM900 Shield not working with Arduino.

To keep it short I have a list of concrete questions:

  1. Is the Arduino GSM library compatible with the Geeetech GPRS/GSM SIM900 Shield?
  2. On the board the green LED blinks every 3 seconds which I have read means that it is connected. However, when I try to use any of the GSM examples, in regard to internet, I either get error messages or simply no progress in the program. For instance, in the testGPRS sketch it sits stuck at the port where it says "Connecting GSM network...". And in the bandManagement example sketch it can't find the current band,as well as the modem not responding, well basically nothing works, except that the shield itself indicates it is connected to a network.

The SIM card I'm using is data exclusively and can't be used for voice calls or SMS. It has no pin code and works as my secondary SIM card (it shares the same subscription as my primary card).

Edit: I have now tested the SMS capabillities of the board with another simcard, that works with no problems, seems only the internet won't work.

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  • which arduino board are you are using? How are you are powering this board? – ARK Apr 19 '16 at 10:12
  • Im using arduino UNO, i power it through USB on my laptop. – Mads Apr 19 '16 at 18:18
  • I have also acquired a 9 Volt battery to test if extra power will help when I have tried it I will respond with the result. – Mads Apr 19 '16 at 18:27
  • These modules consume a lot of current (2A at least) when using GPRS. A 9V battery is no good as it cant supply this current. Look for an 18650 battery or 3.7 V LiPo cell that can supply 2A easily or a wall adapter coupled with a buck converter. Voltage should be at least 4 V but no more than 4.7V. – SoreDakeNoKoto Apr 20 '16 at 0:55
  • Ok so i tried the 18650 batteries and it is still not working. – Mads Apr 25 '16 at 10:28

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