Originally Posted by andrewjm
I could do it fine on my 7290. Is there something I can change on the 8700?
I'm not doubting you (well, I am, actually), but if T-Mobile has coverage - even weak - in an area, you can not roam onto Cingular. They have roaming arrangements in areas where they have no coverage (like in the US Virgin Islands, where T-mobile has nothing), but not in your house where the signal is weak. You are locked onto your home network.
Sorry - I just don't think it works that way.
If anyone else knows differently, please chime in.