AT&T: on the way to 4G. iPhones 3GS can switch. Not iPhone 4

On a image showed below leaked and courtesy of BGR. AT&T is giving internal instructions to their staff about the similarities and differences between the before SIM cards and the new 4G  SIM cards in order the customers can get the right card for their devices .

The staff have to check out carefully the code numbers of both SIM cards to give the customers the right card 4G SIM card.

The iPhone 3GS and before versions can be switched to the new 4G SIM card but not the iPhone 4 .It uses a micro SIM card.

AT&T was trialing 4G in 2010 and will  deploy the commercial service in the middle of 2011.

Related articles

• In preparation for LTE, AT&T introduces new SIM cards (mobilecrunch.com)
• AT&T Prepping LTE SIM Cards for Upcoming 4G Network Roll-Out (intomobile.com)
• AT&T transitioning to LTE-friendly SIM cards (engadget.com)