Peter Zotov whitequark at
Wed Oct 17 05:50:58 UTC 2012

Hello folks.

I have this GSM module called SIM900D. It has several interesting
1. It has builtin commands AT+SIMEI (guess what it does) and 
(ARFCN lock).
2. It, as far as I know, does not check firmware signature.
3. It has an API (called "Embedded AT") which can be called from the
customer's module running on the same CPU (ARM926EJS).
4. Non-stripped firmware ELFs are available, together with the
descriptions of public API.

Here is a (Russian) page with all of the relevant datasheets collected.
Datasheets are in English.

See also:

   WBR, Peter Zotov.

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