The Samsung Galaxy S4 on T-Mobile is receiving an OTA update today reaching Android to version 4.4.4 KitKat. The update weighs 403 MB and adds Wi-Fi calling enhancements and besides changing the Android OS to version 4.4.4, although T-Mobile did not specified via its software support page you should also expect some other improvements and fixes that will provide an enhanced Android experience.
As usual in the case of OTA releases, the rollout of Android 4.4.4 OTA update for T-Mobile Galaxy S4 will be in stages, so you may not receive an update notification right away.
Additionally you can check under Settings->About phone->System updates and see if there is any new available update for your device.
The baseband version for this update is M919UVUFNH7 and owners of T-Mobile Samsung Galaxy S4 can also directly download the Android 4.4.4 update via the Samsung Kies app.
Before starting the download and install process make sure that your device’s battery is at least 50% charged and also that you use a stable Wi-Fi connection, for avoiding data traffic or unwanted interruptions during the process.
