Device - Zte Zinger Z667T User Manual And Safety Information

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 Use Wi-Fi

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.
Calling.
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