Chrysn, yes, Simcom tech department sucks... they've had some internal issues on the move from SIM340 to SIM900. They are chinese and english docs are poor and mostly non-existent. We've had a tech contact long ago but hopefully I haven't contacted them for years. Regarding the hw, you are too close to the limit, I've never run them bellow 3.6V. You need a heck of a stable power supply to drop only 0.1V with a >2A pull. It might work OK in the lab/city (close to the cell) and fail on a moving truck. Should you need anything else, you can pm me so we don't bother lwIP users.
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