Would an unlocked ATT 5s work on Verizon? I know it works the other way around (Verizon to ATT). I want to sell mine but I want to be sure not give my buddy any problems on Verizon.
The quick answer is; it would work. AT&T 5s to Verizon
The new concept to grasp is that Apple made devices to have certain carrier bands and to have all models to have a LTE bands available.
2G Network GSM 850 / 900 / 1800 / 1900 - all models
CDMA 800 / 1700 / 1900 / 2100 - A1533 (CDMA), A1453
3G Network HSDPA 850 / 900 / 1700 / 1900 / 2100 - A1533 (GSM), A1453
CDMA2000 1xEV-DO - A1533 (CDMA), A1453
HSDPA 850 / 900 / 1900 / 2100 - A1457, A1530
4G Network LTE- all models
AT&T has the A1453 GSM model, however all models of the iPhone 5s have LTE bands, so it would work on Verizon
-the reverse-
Verizon has A1453 CDMA model, however all models of the iPhone 5s have LTE bands, and can work on AT&T's 4G LTE network.
The quick answer is that it "could" work from a technology standpoint.The quick answer is; it would work. AT&T 5s to Verizon
....
I know this is an old thread... and I know that the iPhone 6/6s have different internals than the 5s...
However I have an iPhone 6+ that was originally LOCKED to AT&T. It has since been unlocked through a request to AT&T (hooked to iTunes to complete unlock upon iPhone restore.)
I have a coworker who has a Verizon 5S and I put his SIM in my iPhone 6+ and to my pleasant surprise upon reboot it said "Verizon LTE" and also had all the cellular data/voice working perfectly through his Verizon SIM. I popped my ATT SIM back in and it works with ATT still, as well.
SO... I'd imagine the "point" of saying that Verizon wont activate a phone that was not "originally" made/registered for/to Verizon is incorrect, at least for the 6/6+.
Again, an old thread, but possibly will help someone while searching...