HTC One E8 - Manual (Page 85)

Phone Calls 72
Tip: To check if Wi-Fi Calling is enabled, swipe down from the status bar. Touch the Wi-Fi Calling
ready notification to update your profile address or change the Wi-Fi Calling settings.
Make a Call Using Wi-Fi Calling
Call your contacts using Wi-Fi Calling.
1. Touch > to display the phone's dialer screen.
2. Enter the phone number of the contact, and then touch .
3. To hang up, touch .
Turn Off Wi-Fi Calling
Turn Wi-Fi Calling off when you don't need it.
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Swipe down from the status bar, and then touch TURN OFF WI-FI CALLING below the Wi-
Fi Calling notification.