How to Use Call Features in Yahoo! Messenger

1. Sign up for Yahoo! Messenger Phone out service. You do not need to sign up for any services to make PC to PC calls, but you'll need to sign up to make PC to phone calls. To sign up, go to the Yahoo! Voice website and choose 'Phone Out' from the menu. You'll need to purchase prepaid credit at the site.
2. Get equipment. In order to make calls with Yahoo! Messenger, you will need a microphone and headset connected to your computer.
3. Run set-up. When your service and equipment are in place, choose 'Call Setup' from the Actions menu. Setup verifies that your equipment is working.
4. Place a PC to PC call. To call a Yahoo! Messenger contact's computer for free, choose 'Call Computer' from the action menu. Then, select the contact and click on the Call button. Your contact needs to be signed in to Yahoo! Messenger for this to work.
5. Call a cell phone or landline phone. Choose 'Call a Phone Number' from the action menu. Then, enter the phone number and click on the Call button. Rates vary depending on what country you call.
6. Acquire a dedicated Yahoo! Messenger phone number so you can receive phone calls from anywhere, from anyone, anytime you are signed into Yahoo! Messenger. To sign up, choose 'Phone In' from the Yahoo! Voice website. There is a monthly charge for a Yahoo! Messenger phone number.