A couple of years ago, an enterprising set of soldering-wallahs in the US cut the guts out of an old Bell rotary phone and fitted it with a lashed-up cellular rig. The GSM module was the 'easy' bit, the LD-to-binary was a one-cigarette problem solved with a PIC. I have this vague idea that it would have been simpler to do it with some CMOS logic,
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Utterly absurd, but raher charming!
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http://www.sparkfun.com/commerce/product_info.php?products_id=81
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You can get GSM/GPS modules from other supplies as well (Siemens/Motorola also make them) but the Round Solutions one have the advantage they provide ready-made PCBs you can hack with.
Having said that, initial prototyping is easier with modules like these - the command set/interface is almost identical to the Round Solutions kit (it's just the GPRS sign-on that's slightly different).
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