Make free calls using yahoo messenger

use Yahoo Messenger for making free PC to mobile phone calls.Select a friend in your contact list and click the Call button to get started. You and the friend you call both need Yahoo! Messenger, plus a microphone and speakers (or headset). If you own a laptop, you probably have these tools already built-in.
Inside your Yahoo messenger dial 18003733411 and press enter
then you will hear a voice message wait until the end of it
then dial any number you want with international format