AT&T's plans to roll out a 4G network in 2011 are well underway, judging by this leaked internal memo. Courtesy of BGR, the leak shows AT&T is readying 4G SIM cards, with as many as eight different variants. Store employees are being urged to double check the numbers to ensure they provide customers with the right card.
The iPhone 4 is excluded from the new SIM cards, as it uses a micro SIM card. iPhone 3GS and earlier models can still use the new cards. AT&T has previously said it was trialing 4G in 2010 and would roll out the commercial service in the middle of 2011.