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Default SMS App
In the
Settings
app, touch
More
under Wireless & networks
and select
Default SMS app
to choose the preferred
application for sending and receiving SMS
Wi-Fi calling
With Wi-Fi Calling you can send and receive calls and
messages over a Wi-Fi network using your existing T-Mobile
service. See
Device
Storage
Check memory information for your memory card and internal
storage.
Unmount SD card:
Unmount the memory card from your
phone so that you can safely remove the card while the
phone is on.
Erase external SD card:
Erase all data on your memory
card and prepare it for use with your phone.
Battery
Check how much power remains for the battery and what has
been using the battery.