GSM phones on 3G connections vulnerable

A research team from Israel found that the A5/3 cryptographic system used to secure the 3G connection in GSM phones are potentially vulnerable.

Does this mean your GSM phone on a 3G connection is more prone to security breach? Should you be really, really worried?

Maybe.

Global System for Mobile Communications (GSM) is the most widely used mobile phone protocol, with about 80% of all mobile phones using it worldwide. Some of the well-known networks providing GSM phones in the USA are AT&T and T-Mobile.