November 07, 2010 
SoSly 
The video above shows it all, iOS 4.2 on iphone 3g will definitely give the old phone a performance boost. Compared to the older 4.0 firmwares, iOS 4.2 is just a lot more responsive and makes the iphone 3g pleasant to use once again.
Video: iPhone 3G Gets Performance Boost With iOS 4.2
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what about multitasking…those that work on 3g with 4.2it???