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It might be time to go, should i upgrade?

If you get good 4G connectivity from your Thunderbolt then I'd stay. If you get spotty 4G, just to give you an idea, I would get no 4G connectivity in my house with the TB to consistent 4G connectivity with the Rezound. I'd recommend anyone that isn't getting the best 4G on the Thunderbolt to look at the Rezound. I am quite impressed with the improved sensitivity of 4G as well as the better battery. I didn't expect it to be such a step up from the Thunderbolt, but I was surprised.
 
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