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You can place and receive internet calls over a wireless network.

From the Home screen, tap Phone. If open, tap the Back button to 
close the onscreen number pad. Tap the   then Internet Call . 
Enable internet calling by tapping Use Internet calling. Tap 
Accounts > ADD ACCOUNT to add an internet calling account.
Enter the Username,  Password, and Server  information and if you 
want this new account to be your primary internet calling account, tap 
Set as primary account. You can also configure optional settings 
such as Display name,  Outbound proxy address,  Port number, 
Transport type, and Send keep-alive.

Open an existing internet calling account and make the edits you want 
on the SIP account details. Tap Save to save your changes, tap 
Discard  to discard the changes,  or tap the Menu button and then 
select Remove account to delete the existing account.

You can configure your phone to use internet calling (when you’re 
connected to Wi-Fi) for all calls, only for internet calls, or to ask each 
time you place a call.

Once your have created an internet calling account, you can toggle off 
and on the internet calling feature on your phone. From the Home 
screen, tap Phone. If open, tap the Back button to close the onscreen 
number pad. Tap   then Internet Call. Enable internet calling by 
tapping Use Internet calling.