The Verizon and the T-Mobile Galaxy S20 variants are already receiving Android 11 (though the rollout has been halted for the latter), and now the AT&T S20 and Note20 series are joining their siblings. The OTA update weighs a hefty 2.5GB and packs the latest tweaks to Android and One UI, which has reached version 3.0 with this update.

Android 11 with One UI 3.0 on an AT&T Galaxy Note20.

AT&T has yet to confirm the rollout on its support website for the Note20, but we've received multiple reports and screenshots showing how the update is arriving. The AT&T S20 help document indicates that the latest December 10 release is still running Android 10, but that appears to be a typo — the changelog and reports on Twitter with the same build number show that it's actually Android 11, corroborated by Redditors.

AT&T Galaxy S20 series

Release date: December 10, 2020
What's new: Network performance improvements and Android 11 OS update
Security patch level (SPL): November 1, 2020

Baseband version:
G981USQU1CTKH (S20 5G)
G986USQU1CTKH (S20+ 5G)
G988USQU1CTKH (S20 Ultra 5G)

Build number:
RP1A.200720.012.G981USQU1CTKH (S20 5G)
RP1A.200720.012.G986USQU1CTKH (S20+ 5G)
RP1A.200720.012.G988USQU1CTKH (S20 Ultra 5G)

File size:
2.5GB (S20 5G), 2.5GB (S20+ 5G), 2.5GB (S20 Ultra 5G)

As always, the new software is rolling out in stages, so you might have to wait a while until it hits your phone. Try to check if the update is already available to you in Settings -> System updates -> Check for system updates.