I also have a 7100t. I unlocked it using the code from T-Mobile. When I inserted the SIM card sent to me by Cingular, it showed "SIM card rejected".
I changed the internet browser option to
http://device.home after reading a post on this thread.
What else do I need to do to use the new Cingular SIM card???
Also agree with posts I've read on this forum about class action lawsuits against cell phone companies for all these restrictions - think about how many posts would have been avoided!!!!
Thanks in advance...
troie99