Hey guys, Recently purchased 30+ iPhones at an electronics repair store that's going out of business. These phones are all gently used/like new and very little to no information (original carrier, country of origin, ect) was provided about these devices. Models range from iPhone 5c through iPhone 7. Looking to accomplish 3 things for each phone: 1) Make sure they're all 100% functional (no charging, touch screen, connectivity issues) 2) Carrier unlock them. I know some phones have hardware that only allows them to work on a CDMA or GSM network. Need to make sure if they're carrier unlocked they'll work on all 4 of the major carrier networks. 3) Confirm none of these phones are blacklisted or unable to activate. Any idea of the best way to do this?