A small firmware update has been released for the T-Mobile Xperia Z1s (C6916) that moves the build number from 14.4.B.0.37 to 14.4.B.0.56. This is a minor update with no noticeable changes. The 4.2MB update is currently rolling out OTA. If you have updated, do let us know your impressions below.
Update: A changelog from T-Mobile is now live:
– T-Mobile Free Inflight Texting support
– Wi-Fi calling enhancements
– Software stability improvements
– Camera improvements
– Bluetooth improvements
Thanks Matthew and WilliamTell13!