In getting ready for my new iPhone 8+, what places are offering the best prices to buy back old phones? I've checked Gazelle and USell. Who else is paying well for used phones? I'd rather not go the eBay or Craigslist route, as my phone is not in excellent condition. I've got a 128gb T-Mobile 6 in silver that's in good working condition and a 16gb T-Mobile 6 in silver that's been water damaged (doesn't turn on), but is in excellent cosmetic condition.