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I prefer my phone to be available as a phone. 5 hour battery life after using tethering just doesn't work out.
 
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I use 3G all the time. I would definitely use the iPad less if I didn't have it so it's worth it to me. Plus I think I would rather have it and not need it than need it and not have it. I have use the mywi but it takes a toll on the battery.
 
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