Do you have access to free WiFi at work and home and are you one of those bloke who dont use mobile internet coz of this reason. Then you should hate it when some application switch from WiFi to 3G and rack up your mobile bill. MoDaCo NoData will be a lifesaver for you all. It lists your GPRS connections, and allows you to disable them so that they won’t be used. Disable your connections and re-enable them whenever you want.
Source : modaco.com