If you're on a BES the app will work with no modifications.
If you're not on a BES then you have to add the proper apn into the TCP settings and check the box in BBWeather that says "disable MDS proxy."
Go to Options >Advanced Options >TCP. For TMobile the apn should be:
apn:wap.voicestream.com
username
password
leave username and password blank.
This is all in this particular thread.
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