Mobile data toggle?

you can use "APN android" from the market (available both Free & Paid)

I hope that's what are you looking for

For the best usage experience u should also download "3G watchdog"
 
Take a look at Quick Settings in the Market...it is a free app. Works really well for turning off the mobile data and takes care of the connection issues that some have experienced when the phone shows connected to the network but the apps say the phone wont connect. Just go in to Quick Settings, turn off the mobile data and then turn back on.
 
Power control widget is a pretty cool widget for toggling wireless. You can get it from the market.
 

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