: 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.

Buying a OnePlus 5 specifically for use on AT&T is due to these permanent connectivity issues. OnePlus 15 Review: Hard To Kill

: The phone supports Bands 2, 4, 5, 12, 17, and 30 , which cover the majority of AT&T's LTE footprint. Purchasing Advice (2026)

The (released in 2017) is no longer officially supported on the AT&T network following the 3G "sunset" in early 2022. While the hardware technically supports many of AT&T's 4G LTE bands, the device is not on the official AT&T Whitelist , which is required for making calls over the current network infrastructure. Network Compatibility Status