: AT&T requires VoLTE (Voice over LTE) for all devices. Because the OnePlus 5 is not on the AT&T Approved List , it often defaults to 3G for calls, which no longer exists on their network.
Buying a OnePlus 5 specifically for use on AT&T is due to these permanent connectivity issues. OnePlus 15 Review: Hard To Kill oneplus 5 at&t buy
: You may still get LTE data service if you swap a previously activated SIM card into the phone, but you will likely be unable to make or receive standard cellular calls. : AT&T requires VoLTE (Voice over LTE) for all devices
: The phone supports Bands 2, 4, 5, 12, 17, and 30 , which cover the majority of AT&T's LTE footprint. Purchasing Advice (2026) oneplus 5 at&t buy