Samsung SCH-I515MSAVZW - Manual (Page 50)

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Place an Internet (SIP) call
You can place calls over the Internet when connected to a Wi-Fi network, rather than over your mobile
network. To do so, you must first configure your phone to use an Internet calling account.
After you set up the account, placing an Internet call is no different than placing any other call. However,
you must be connected to a Wi-Fi network. When you're making an Internet call, the phone displays
Internet Call near the top of the screen.
Internet calling is based on the Session Initiation Protocol (SIP) for voice calls on Internet Protocol (IP)
networks.
Important Calling a phone number over the Internet requires that your service provider supports it. You may incur additional
charges. Check with your service provider for details.
To add an Internet calling account and configure your incoming and outgoing preferences:
1 Touch the Phone icon on a Home or All Apps screen.
2 Touch the Menu icon .
3 Touch Call settings.
4 At the bottom of the screen, under Internet call settings:
To change your incoming call preference or account settings, touch Accounts.
To change your outgoing call preferences, touch Use Internet calling.