Switching from Big Red to T-Mobile tomorrow So I'm aware of the promo which is great. Me and my wife both have iPhones 6s plus and 7 plus. 6s plus wtf will get paid for and the remaining balance on my 7 plus will also get paid off by T-Mobile, but do I need my last bill stating how much I owe on my 7 plus? Also any other documents needed? 

Also how long will it take for T mobile to pay the remaining balance and etf? 