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3G logo gone when calling?

Yea, I think CDMA Technology doesn't use 3g for calls, and you can't use 2g and 3g at the same time. Correct me if I'm wrong.

Yes I believe this is correct, 3G is used for data only. My Droid has always done this (the 3G logo disappearing and showing bars only) while on calls.

This, of course, means that you can't use data while on a call (pretty much the only advantage AT&T/IPhone has over Verizon/Droid line, although that is basically negated when you compare overall signal quality/coverage anyways).
 
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