Time is not conducive for mobile VoIP services as of now. It has far less impact and not so widespread as those operating over PCs. There are all sorts of technical issues that make mobile VoIP services difficult to implement. Hamid Akhavan, CEO of T-Mobile expressed his views on MVoIP applications at the 3GSM conference in Barcelona.

Talking to the reporters in the sideline of 3GSM conference, Akhavan said that technical issues related to how networks pass on IP address of mobile users have not been completely resolved.

He has also pointed out,

Emergency phone service and ‘always on’ connectivity are also big issues, since staying online takes up bandwidth on pricey mobile networks. And then there’s the cost. When people talk about VoIP, they think free. With any mobile service provided over the Internet, you’re going to need to buy a data package.

The mobile voip application has been under intense debate ever since Hutchison 3G lauched their mobile VoIP services last year in Europe.