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Evo 4g vs Optimus V (just for wifi tethering)

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http://forums.androidcentral.com – I use an optimistic V, and my cousin asked me about wifi cards- I told her a tethered vm phone would probably be cheaper since she just wants it for email on her ipad. After a quick search, the evo 4g. Seems to be the cheapest vm 4g phone. I'm posting here for opinions... would the difference between 3g and 4g be noticeable? Also, would the HTC require root like my OV did? Is there a reliable rooting program for the evo like gingerbreak on the OV? (HowTos)