Acer S520 - Manual (Page 29)

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Calling a phone number using Internet calling
If you have configured your phone to place all calls using Internet calling or to ask for
each call, you may also call a phone number using Internet call, whenever you are
connected to a wireless network.
Dial the number and tap , or select the contact you wish to place a call to, then
tap the Internet call account you want to use to make the call.
Important: Calling a phone number using Internet calling requires that your
service provider supports it, and may incur additional charges. Please contact
your service provider if you have any questions.