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An app to turn off 2G/3G?

I use cardiotrainer on long bike rides and i'm trying to conserve as much battery on my Desire as possible.

I'd like to be able to turn off the phone 'side' of the desire and just use it as a data logger. Also I don't want to be disturbed by people trying to call me.

So is the an app that acts as a phone on/off switch?

Thanks in advance. :)
 
But wont that also switch off GPS?

I'm guessing if Mr Sword is using cardiotranier on a bike ride he's probably tracking his route.

You could at least turn off the internet by holding the power button.

Indeed I am using GPS! :D At the moment I turn off the 3G radio but I was wondering if you could turn off the 2G radio as well?

I just want my smart phone to be smart! ;)
 
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