If you are one of the many who use their Apple iPhone for internet access rather than using it as an actual mobile phone you may be interested to know that AT&T has just announced a new data only plan via AT&T Pay-As-You-GO prepaid wireless service.

The plan is $20.00 a month for unlimited data only which give Apple iPhone users the option to put their shiny multi-touch mobile phone to use for gaming, email, internet, and PDA functionality, everything for the net user except voice calls.

AT&T’s $20.00 a month plan breaks down like this: Activate your iPhone to work with the Pay-As-You-Go SIM card through iNdependence, purchase an AT&T pre-paid SIM card and load it with minutes, Call “611” and register your new SIM card, and use the telephone-based system to buy the “Unlimited MediaNet” package for $19.95 (at the voice prompts, indicate that you want to “Buy Features” and then “Data Packages”)

However remember the unlimited data package is only good for one month and will need to up your prepay account every 30 days with another unlimited package. AT&T will charge $10.00 for every megabyte used should you go over the 30 day period, but maybe it’s worth the slight risk of forgetting to renew now and again for cheap unlimited data on the Apple iPhone. Or just simply keep your eye on the data package run out time and everything should run fine.

Source — TUAW