Why bother trying to hack it? For $40 you can get an Arduino with a cell modem built it: http://www.seeedstudio.com/depot/Seeeduino-GPRS-p-1909.html http://www

Why bother trying to hack it? For $40 you can get an Arduino with a cell modem built it: http://www.seeedstudio.com/depot/Seeeduino-GPRS-p-1909.html http://www.seeedstudio.com/depot/Seeeduino-GPRS-p-1909.html What about a SIM and data plan you ask? Head over to: http://neo.aeris.com/ http://neo.aeris.com/ With just a credit card, no contract required, you can buy a SIM for $2.75 and $1/month gets you 750k of data. You can turn SIMs on and off month to month. You have to buy 10 SIMs to get started but they are having a promotion right now to get 10 SIMs for the price of one. I have no connection to either Seeed Studio or Aeris other than being a happy customer of both