Sharp AQUOS Crystal - Manual (Page 357)

Settings 348
6. Touch Wi-Fi Calling to select the check box, then touch Save.
Wi-Fi Calling is enabled.
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Once your current location is obtained, you can touch Save. You can also set your current
location by entering it in the entry field.
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You can select the Locate Me check box to relay your location when making an emergency
call with Wi-Fi Calling.
Make a Call with Wi-Fi Calling
When you make a call and Wi-Fi Calling is enabled, Wi-Fi Calling is automatically used for the call.
For details on making a call, see
Call Using the Phone Dialer or Place Calls from Contacts/Call