Pre-Ordered a SG 16gb S for my dad. I tried canceling my order on Monday the 21st, because he wanted the 64GB instead. I couldn't cancel the order, so I went to the store on the 26th to return and repurchase a 64GB. All seemed simple enough until I started getting email alerts saying my dad went over his data. I wondered how that was possible since he has unlimited data. I called ATT and they told me that the plan was switched when he upgraded because the unlimited data plan doesn't support the new iPhone 6S. The idiot at the store went ahead and changed my dad's plan from unlimited data to 300mb. No wonder he said "I'll just email you the receipt". He never spoke a word about my plan changing. ATT was adamant about not being able to have unlimited data. They opened a case for me per my request since I didn't give consent or authorization for a data switch. Even if I did, why the hell would I get 300mb?? Just goes to show that they didn't advise me or ask me. This is the second time they've taken one of our lines off unlimited data. It was such a headache getting it back that time. They swear it's that difficult to switch it back. If they can't do it then I'm just going to ask for a return of the phone so my contract and upgrade can go back to how it was and move my dad's line to TMobile. They even had he nerve to advise my dad not to use data until it is resolved, so we don't get charged overages!! I told them we pay for service and they changed my plan without consent and they better drop all data related overages. TLDR: ATT changed my Unlimited Data Plan to 300mb after paying $299 for the iPhone 6S at the 2 year upgrade price. I have a ticket open and they "assured" me that it will go back to unlimited.