John P. told me to buy a battery at Batteries Plus w/o looking to see if my "warranty" would replace the battery. My iPhone's power was draining fast, & to get me out of the store so he could make a sale instead of helping a customer, he sent me to an unauthorized battery replacement business. I charged the iPhone all night in the off position, drove to the Official Apple Store at Penn Mall. Brodie at the Apple store was a huge help. He said Apple couldn't work on a non-authorized repair, that John at AT&T said for me to make. If one is expecting real knowledge, don't ask Kaitlyn, Asst. Store Mgr., because she could not resolve their mistake either, plus she didn't offer to call AT&T. She was curt, rude, & had no patience w/ a customer of thirty years. She did say, "...we're human, & we do make mistakes" which was energizing to know. What this alleged asst. manager should have done was to own up to the verified error of one of her associates, call AT&T right then, & resolved their mistake. No such luck; bless her heart.