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The voip mobile service for 3G phones was launched by Skype and can be downloaded from its website directly to the phone in much the same way as a new ringtone or game would be. It will operate on more than 40 handsets from Motorola, Nokia, Samsung and Sony Ericsson and work in countries including the UK, Denmark, Finland, Poland, Sweden and Brazil.

Skype's new mobile application takes advantage of the fact that many of today's phones use high-speed 3G technology for video calling and web browsing. Connecting to Skype's service costs the same as a national-rate phone call but you can then talk to other Skype users at no extra cost, whether they are in San Francisco or Swindon.

Understandably, this has some mobile phone networks - which can charge 30p a minute for UK calls and many times more for international ones - worried. If users migrate en masse to Skype's service it will cost them millions in lost revenue. Already three of the UK's four biggest networks (O2 T-Mobile and Orange) have banned customers from using mobile Voip services on their phones. Vodafone, takes a more pragmatic view. It offers unlimited browsing to most new contract customers, and has decided not to block mobile Voip applications.

A Vodafone spokesman said: "Our internet offering is unlimited so you can use it for anything you want. However, most of our customers don't use mobile Voip because they get customer service and quality of service already with their traditional calling plan."