apart from the SMS part (which is simply a matter of hooking up some libraries any service provider should be able to provide you with as part of a contract for their services) this is something that's probably been done by everyone who's ever written anything.
And if you substitute other communications technology, that's pretty much a certainty.
The SMS part is also far from unique.
So any search engine should be able to provide all the information you need.
jwenting
duckman
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