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