We just received a shot of an internal AT&T memo detailing the carrier’s intention to start transitioning to LTE-capable SIM cards. AT&T has started preparing employees for a new SIM card that will be used for LTE handsets and devices, all except the iPhone 4 since that uses a microSIM card. AT&T tells employees to verify the SIM card is correct by checking the SKU on the card even though the new LTE cards are visibly different, just to be safe we’re assuming. It also appears there will be up to “eight different SIMs” during the transition, so verifying the SKU might be the only way to go. Well, it’s a start, no?