Automatic 2G-3G-2G?

[hilzi]

Does anyone know whether there is an app that could automatically switch between 2G-3G? Or if anyone is working on such app...
Idea would be that user could define which apps can activate 3G mode ie. browser, etc that require higher speed and after application quit's (for example with automated task killer) the phone would switch back to 2G. This would save battery without a hassle to switch manually.
I know that there are widgets that takes you to switch option with few clicks, but still...
Is there any technical issue that would prevent to make such app? I am not a programmer so take it easy...

 

[blundell]

But surely you would want to select 3G for all apps you use?

What you really want is to turn 2G off and only ever use 3G or nothin!

When the phone goes into sleep mode you can select this as a powersaving setting anyway