Sharp AQUOS Crystal - Manual (Page 356)

Settings 347
Wi-Fi Calling is enabled. Available Wi-Fi networks are displayed.
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To disable Wi-Fi Calling, touch the slider again .
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When prompted to accept a Wi-Fi Calling service agreement, follow the onscreen
instructions.
4. Touch the Wi-Fi network you want to use with Wi-Fi Calling.
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The touched Wi-Fi network is displayed under WI-FI CALLING ENABLED WI-FI
NETWORKS.
5. Touch the Wi-Fi network displayed under WI-FI CALLING ENABLED WI-FI NETWORKS.