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GSM is a very widely used standard for communication over mobile phone networks.

2 votes
Accepted

Sim900a AT+HTTPREAD does not get fully answer

Apparently you were running software serial at too high of a baud rate (57600) and bringing it down to 9600 fixed the issue.
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2 votes
Accepted

Can I put a T-mobile sim card into the SIM800L Module?

It might work but you'd be better off getting a 2G dedicated card. Hologram.io has a developer card that is $5 and free 1MB / month or something.
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  • 521
1 vote

GSM+GPS modules

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. …
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