You can place calls via the Internet when connected to a Wi-Fi network, rather than via your mobile network, if you have configured your phone to use an Internet calling account. Internet calling is based on the Session Initiation Protocol (SIP) for voice calls on Internet Protocol (IP) networks.
You must add (or have synced) a contact’s Internet calling address in Contacts to place an Internet call to them.
Phone places the call, displaying the Internet calling address and Internet call on the Dialing screen.
Once you’re on the call, you end the call, add other Internet calls, and use the other Phone features in the same way as you would for a mobile network call.
If you have configured your phone to place all calls using Internet calling or to ask for each call, you simply place calls to contacts with phone numbers as described in this chapter, whenever you are connected to a Wi-Fi network: the call is placed using Internet calling instead of using your mobile network and the phone displays Internet call.
Important: Calling a phone number using Internet calling requires that your service provider supports it, and may incur additional charges. Be sure to check with your service provider for details.