I'll try to keep this short as possible, lol. Anyways, my wifey has an Android phone right now. She wants an iPhone next and so I'm planning to get her the new 6s/6s+ (still deciding which). We are on T-Mobile. The T-Mobile stores (2 Stores) around us tend to NOT carry the high storage variants of iPhones. She needs that 128GB storage. So I was planning to buy it through Apple's website when pre-orders are available. I am a bit lost as to how I would activate the new iPhone once I receive it. I see there's an option to select a "T-Mobile SIM" on the website. Would I be able to activate and transfer her phone # and plan onto the iPhone myself at home or do I need to go into a T-Mobile Store and do all that since she's coming from an Android phone?