Gave my brother my old iPhone 5 on verizon, he put in his AT&T sim. Works fine, other than the battery suddenly dropping about twice as fast. I checked his battery usage in settings, just shows the apps he's been using. It's dying at a rate of about 1% per minute without using it. Wasn't doing this before I gave it to him. Would using the phone on a different carrier than originally set up for matter?
