The Telit Modules are good if you want a GSM solution.
They have a micro on board that you could create the interface code
and they have a Python interpreter too for quick solutions.
A Telit Module, max232, 3V8 PSU and antenna is all you need in the box.
Get your Service Provider to give you a unique APN and you have secure
end to end serial communications.

Cheers
Chris
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