Radio ?

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Can anyone verify what the better radio is for internet connection while tethering. I'm on the sprint radio .30 now, and was wondering if the .50 bell radio is better. My situation is when I'm at work I get evdo service with the .30 radio, but there are maybe 1 bar or no bars and the connection is slow. So I was wondering if I upgrade to the .50 radio if I would get any better service hell even if its 2 bars i'd be happy because it seems when the bars spike to 2-3 my internet speeds up almost triple.

Also is there any harm in downgrading to the .30 from the .50 rom, since they are both gps and rev a i wouldn't think so, but i'm not sure.