You can get a 7100t unlocked and use it on Cingular service. A SIM card would cost you $20 or $25. All you would have to do is set up, the Cingular settings on the phone, which is posted on Howard Forums under the Cingular tab. Cingular BlackBerry support 800-304-3044 can give them to you as well. You will also need to get a BB data plan and a voice plan. Text messaging is optional. Yet, you can use BlackBerry Messenger and Ramble IM without having to incur fees for texts sent. They both use data, which you'll already have when you subscribe to a BlackBerry data plan. I have also known others to have an unlocked 7100t on Cingular and only use it as a phone and for text messaging. Yes, it is possible. Yes, it does work.