Programming APN in SIM900

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  • Updated 3 years ago
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I'm using an Android SIM900 prototype board, but connected directly to a PC (no android) through a USB serial link, and I'm using the as a front end, which I've found is an excellent tool.
I'm using a SIM which was activated as Provision several days ago and upgraded to Bill a few hours ago.  It's ICCID: 89185014080500002505
I found no SIM900 AT command to program the SIM with the APN, but I noticed that the response to the AT+CGDCONT? command was:
+CGDCONT: 1,"IP","","",0,0
so the APN must have already been programmed in the SIM

However, when I try to attach to the network I get a 133 error which indicates "requested service option not subscribed" which seems to indicate a SIM problem.

Can you provide any suggestions so that I can attach and transfer data...
Photo of Ben Cooper

Ben Cooper

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Posted 3 years ago

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Photo of Bob Heckmann

Bob Heckmann, Official Rep

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Hi Ben,

Thanks for posting this question. Your SIM cards are associated with a different APN than the one in your example. Please retry the AT command using the following APN:

Our online tutorial shows the APN you referenced in your post. We're in the process of revising the tutorial to reflect the APN and apologize for the inconvenience.