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The GSM module can estimate it's location based on cell tower triangulation but if you want a more accurate location then you need to use a GPS.


It might work but you'd be better off getting a 2G dedicated card. has a developer card that is $5 and free 1MB / month or something.


Definitely related to poor antenna matching. This is complex stuff and should preferably be fixed by changing antenna matching (e.g. by a matching circuit or simply trying out a different antenna). I have also seen that it helps to wait until you get the unsolicited modem response "Call Ready". Until you get this message, it can disturb the modem to receive ...

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