Hi. i want this android phone off eBay, (LG Optimus G) and its only for AT&T. i currently have an iPhone 5C, and it has a nano sim, and the Optimus G has a Micro sim, so its bigger. just wanting to know if i buy a sim adapter kit, will my AT&T SIM work? or will the adapters screw it up, or will it not activate? just asking, i don't want it to charge my account.