Operating Instructions

Internet calls
When you're connected to a Wi‑Fi network, you can make and receive calls
through an Internet calling account.
Before you add an Internet calling account, make sure that you've
registered with an Internet calling service that supports voice calls
over Session Initiation Protocol (SIP). Internet calls to phone
numbers may incur additional fees.
Adding an Internet calling account
1. From the Home screen, press , and then tap Settings > Call.
2. Under Internet call settings, tap Accounts.
3. Tap Add account.
4. Enter your account details.
5. Press to save your account.
6. To set HTC Thunderbolt to receive Internet calls on your added
account, tap the Receive incoming calls check box.
68 Phone calls