A:AnswerCant answer all of your questions, but this phone will not work with Verizon since Verizon operates on a cdma network and this phone is set up to operate on a gsm network such as T-Mobile’s network. It is not all iPhones, but this one in particular. There are other iPhone 7’s that are set up to work on the cdma network. You’ll want to seek out one of those specifically.
A:AnswerI bought a regular pre-owned iPhone 7 before buying one that's verified excellent and the back came with some scratches and it lags often and drops the WiFi every few minutes. When I bought the one that's in excellent condition and there were no scratches and so far is doesn't drop the WiFi. I would recommend just buying the one in excellent condition because the restocking fee is 10%, in my opinion it's worth just paying extra the first time and not deal with a phone that glitches.