I dont know if this work on all phones but i have only tried it with some java phones 2700,xpressmusic and c3,but you have to try it on your phone cos its absolutely free to the same networ eg mtn to mtn and airtel to airtel.

You might have heard of voice command,yeah its available for your phone as long as your phone is more powerful than c1_01.

First of all,you need to set your voice command,dont worry,its isnt too difficult,your phone will be displaying name for you to pronounce and make sure you pronounce it with the same voice or tone,the steps are twenty steps or name.

To set the voice command click Menu>Settings>Connection>Voice Command

Hold press the right soft key and call the name you want to call in english tone and make sure its an mtn number or the same network you have in your phone.When you pronounce the name allow it to dial itself.thats all,goodluck,comment.