HTC One S Start Manual page 31

To stay on a Wi-Fi call, you must remain
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within range of the Wi-Fi network. Your
call will drop as you leave the Wi-Fi
range. When your Wi-Fi signal weakens,
your phone will beep and display a
warning message alerting you that your
call will drop if the signal gets weaker.
Wi-Fi Calling offers three connection options:
Wi-Fi Preferred: All calls are made
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over an available Wi-Fi network. If there
are no available Wi-Fi networks calls
are made over the cellular network.
Cellular Preferred: All calls are
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made over the cellular network
unless the cellular network is not
available, then calls are made over
an available Wi-Fi network.
Wi-Fi Only: All calls are made over
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an available Wi-Fi network. If there
are no available Wi-Fi networks,
your calls will not connect.
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