Sprint is also rolling this update for both version of the Galaxy Watch, The build version is same as below.
Verizon and T-Mobile are rolling out a new update for Samsung Galaxy Watch, which fixes multiple issues and improves the software. Please check the complete changelogs below.
The latest software update from Both mobile carriers has been rolling out as build version R805USQU1BSA7 and R815USQU1BSA7 for 42 and 46mm LTE version respectively.
You can check the update manually via the Samsung Wearable app while connected to the supported smartphone. For that, just go to Settings > About Watch > Update Now > Download updates manually.
This software update improves the heart rate monitoring sensor's reliability.
Although, update screenshot has nothing to show but the T-Mobile support page have summerised the complete changes of this update that are listed below.
Let us know in the comment about what changes this update has brought to your Galaxy Watch on Verizon or T-Mobile.