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4. Tap to enable or disable Wi-Fi Calling.
5. Tap Mobile Networks.
What Is Wi-Fi Calling?
Wi-Fi Calling, also known as Universal Mobile Access (UMA), is provided by some cellular
carriers both to augment their coverage and to provide free calls over Wi-Fi. This is not Voice
over IP (VoIP) calling but a regular GSM voice call, routed via a Wi-Fi hotspot, over the Internet,
to your carrier. Because the call is not using the cellular network infrastructure, the calls are free,
and because of the speeds at which Wi-Fi networks operate, the call quality is much higher
because much less compression is needed. To read more about UMA, try this online article:
http://crackberry.com/saving-call-charges-recession-your-blackberry.
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