ZTE ZMAX - Manual (Page 143)

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VPN
Set up and connect to virtual private networks. See Connecting to
Networks and Devices – Connecting to Virtual Private Networks.
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.
Tethering & Mobile HotSpot
Share your phone’s mobile data connection with PCs or Wi-Fi. See
Connecting to Networks and Devices – Sharing Your Mobile Data
Connection.
USB Tethering
Share your phone’s mobile data connection with PCs or other devices via
a USB cable. See Share Your Mobile Data Connection via USB.
Wi-Fi calling
With Wi-Fi Calling you can send and receive calls and messages over a
Wi-Fi network using your existing the service provider service. See Use
Wi-Fi Calling.