Originally Posted by jabone
The night I got connected on Cingular, they created an account for me. All of my email on my blackberry comes through my myCingular.bb.net email address. So I can manage the inbox accordingly.
If TMO tries to reclaim the phone on their service .......
I apologize if I sound rude but you're actually lucky to have gotten that done... normally it's rather hard to accomplish. Also you can technically activate ANY GSM phone on the Cingular network but the bottom line is that it was not meant to work for Cingular so it may work now and for a short period of time but you WILL have issues with it in the near future.
There has been many instances where european travelers bring their unlocked phone from their carrier in europe and activate it on the Cingular network. No problems setting up the account as it is a GSM phone and Cingular is currently using GSM. The disadvantage to this is that not all your features will work. For example, you may be able to get online, download apps, send and receive e-mails but you may not have as good service as a user who is using a Cingular branded phone. Theoritically you would think that GSM phones are GSM phones and that is partcially true in the sense that you will have the same features but you may not be able to access everything, if you're lucky, your device will work 70% of the time.
Hardware is the same but the software is not and because it's not programmed to work on Cingular you are going to encounter many issues. However, you could contact BB and send them your phone and have them update your software to work on the Cingular network.
I was in Taiwan a few weeks ago and I used both my unlocked Sony S710 and my 7100G however, I did not work as well as I had expected. It scuks but that's just the way things are. I hope you continue to have success with your unlocked phone.