I thought this might be interesting for all Blackberry users:
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"T-Mobile has released that they have found an extremely weird networking routing issue with one of their towers in Pennsylvania. The networking routing problem only occurs with one specific model of Blackberry, the 8700g. The location is Exton, PA with zip code 19341.

The cell site will accept Blackberry 8700g handhelds that travel within the transmission radius, but the tower will virtually "disappear" after the Blackberry 8700g handheld is in the area for more than 2,3,4 and sometimes 5 hours. In other words, the Blackberry 8700g will not be able to find a T-Mobile network after having been in the cell site for more than 2-5 hours.

I happen to work in an office building in this particular site, and I must say it is VERY frustrating. The engineers have been working on it for the past 2 days (the issue initially started on June 10th), but have not found a solution.

If this issue has occured with anyone else in other areas, it would be good to call T-Mobile so they can fix their system, because who knows, it could be a network wide problem. But so far, it has only involved this cell site and this particular model."