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Old 09-11-2005, 09:19 PM   #3 (permalink)
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T-Mobile BlackBerrys do not roam to Cingular unless there is no T-Mobile network in the area, like in the US Virgin Islands. It will not roam to Cingular in a weak area.

T-Mobile has international roaming agreements with multiple carriers. Those roaming agreements do not extend domestically.

Similarly, if a Cingular phone was in a weak area for Cingular, it would not roam to T-Mobile USA.