T Mobile just updated its Samsung Galaxy S5 to Android 5.1.1 and the OTA is rolling out to all devices as we speak. This brings the device to software version G900TUVU1FOF6 just in case you’re interested.
According to the changelog, this brings the S5 to an improved interface with unnamed bug fixes plus the anti-theft feature every Samsung device has been getting lately. You can wait for the update to come OTA or you can install it yourself via Samsung Kies or the Smart Twitch for the PC. You can also find the firmware available at SamMobile.