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Well from what I understand EVDO is not available while roaming. So by ahving it on raoming only I would not have EVDO running when I want to go online. I would consnatly have to switch from roaming only back to allow roaming. This could be handled automatically and would not drain my battery so much, when it would be on allow roaming and the phone would be constantly loosing the signal and getting it back making the phone stay on and look for signals for a long period of time.
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