ZTE Blade 3 - Manual (Page 66)

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4. Touch SAVE.
To configure which calls use Internet calling:
You can configure your phone to place all calls using Internet
calling (when you’re connected to a Wi-Fi network), just calls to
Internet calling addresses, or to ask each time you place a call.
1. Touch the
Home Key > Menu Key > System settings >
Call.
2. Touch Use Internet calling.
3. Touch the Internet calling option you want.
To configure your phone to receive Internet calls:
By default, your phone is configured to make Internet calls, but
not to ensure that you will receive them. But you can configure
your phone to listen for Internet calls made to an Internet calling
account you added to your phone.
1. Touch the
Home Key > Menu Key > System settings > Call
> Accounts.
2. Tick the Receive incoming calls check box. Checking this
setting will reduce your battery life between charges.