[Update: AWS iPhone 5 has cleared FCC approval] In light of the rollout of Apple’s iPhone on T-Mobile, Apple has announced that it will begin selling a very-slightly modified version of the iPhone 5 starting April 12. The “new” version, which will carry the same model number, is different only in that it adds capability for T-Mobile’s LTE network frequencies, known as AWS (Advanced Wireless Services). No other new features have been added, but because the AWS addition requires a hardware change in the cellular radio, current iPhone 5 units cannot be upgraded through software to AWS compatibili…