If you are looking for a compact GSM/GPRS module, you can get the SIM800L from most eBay traders. It is not the most judicious choice, but you can build your own basic GSM projects with a cheap modem ...
Beta-testing Matrix GSM In WashingtonI was asked to take part in a test of the Matrix with GSM module for Comrex in the heart of the nation’s capital. The technical folks in Devens, Mass., were ...
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