For those with a 7100t that it's not working for, this is what I did to finally get it to work:
1) Go to
http://wireless.sra.com/ramble/
2) Click on download
3) Accept the agreement, enter your email address, and click "Submit"
4) Stare at the ceiling for awhile
5) Check your email and you should have the link to the over-the-air download
6) Get that link
7) Download the application
8) Don't bother to run it when it's done downloading. It probably won't work.
9) Go into Tools -> Settings -> TCP
10) Set the APN to wap.voicestream.com
11) Set the Username to your T-Mobile username (probably your phone number)
12) Set the password to you T-Mobile password (same username and password you use to login to
http://www.t-mobile.com )
13) Save it
14) Go into Tools -> Settings -> SRA Ramble
15) Make sure "Netowrk Connection:" is set to "Device Default"
16) Save it
17) Go into Applications -> Ramble IM
18) Enter your AOL Login
19) Enter your password
20) Check Auto-Login if you want
21) Click on "Submit"
22) If you get an error try and login a couple more times, if not then pat your self on the back you're logged in
23) If it still doesn't work then open up your browser and go to a web page. I prefer google, but it doesn't matter. Once the page opens switch back over and try to login again. Don't ask me why it works, but it does.
Long winded but it's real simple. Setup the APN, even if you never needed it before, then run Ramble.