A:AnswerIf you're a die-hard Apple fan, it's a good phone. Just keep in mind this phone is nearly 4 years old and there are newer, better and more affordable unlocked phones with better cameras. I highly recommend the MotoG5s Plus. Bought one for my son and was amazed. I did a lot of research and suggest you do the same before you make a decision.
A:AnswerYes.
Compatible with GSM carriers, including AT&T and T-Mobile
Also compatible with prepaid GSM SIM Kits, including Cricket Wireless, Net10, H2O, GoPhone and Simple Wireless.
A:AnswerI use this on ATT Wireless you should ask you're Straight Talk carrier I'm not sure if this is unlocked just for certain carriers or if Best Buy sells a version that would work for you.
A:AnswerYes, it arrived with zero scratches on the glass, and a total of two barely noticeable scratches less than a millimeter in length. That said I’d expect some stock to vary as these are trade-ins and could vary wildly. (But hopefully not)