A lot of money is invested in mobile VoIP services. The latest proof of this is
an investment in a $ 10 million startup
company Mig33 by Accel Partners and RedPoint Ventures.
Mig33 allows you to communicate via VoIP using a mobile phone, using the idea of a callback. That is, to make a call, you need to send an SMS message, instead of spending your traffic and entering the service's wap site.
In addition to calls, Mig33 allows you to communicate on MSN, Yahoo and AIM. And if you want to talk to someone not from the contact list, you can chat in different chat rooms on your mobile phone.