If you have a cell phone, Nimbuzz.com offers software for calling your buddies on MSN, Gtalk, Skype, AIM, Yahoo for free. All you have to do is download the Nimbuzz software onto your phone. Nimbuzz is not quite as easy to use MOBIVOX, but it has a really nice mobile phone interface. In order to use Nimbuzz you’ll need a mobile phone that supports it.

According Nimbuzz.com “Call from your mobile phone with Nimbuzz, Skype, MSN/Windows Live Messenger and Google Talk contacts! Start Nimbuzz and your contact list appears. After selecting one of your friends, the communication options are shown. Select the ‘Call’ option (the first time a brief explanation of the call feature appears in your screen). Select ‘Call’ and your phone will make a normal GSM call to our local switch in your region. We will then connect you for free to your selected contact.”