jklong03, you will not be able to install the pre-made Web Session file. For some reason PKToolsVS doesn't seem to be able to see the Web Session info like it can for other V3 models. You will have to add a Web Session manually. I have the info posted in another thread, but rather than you having to search for it here it is. By the way I hope you are signed up for "T-Mobile Web". It's the $5.99 plan. Otherwise you will get hit for data charges. The beautiful thing here is once you get this working you can surf the full web on the lower plan, and it's perfectly legal.

Also if you can't figure out the GPRS icons let me know. I had to do a few more seem edits to get them to work, but they are all listed in the seem edit list available on this site.
Go into Web Sessions and make an entry titled T-Mobile (or whatever you want to name it). Enter these settings as I list them. The entries you will see in the phone that I don't list an entry for you leave blank. When you are finished you have to make this the default entry.
Homepage:
http://wap.myvoicestream.com
Service Line Type 1: WAP
Gateway IP 1: 216.155.165.50
Port 1: 9201
Service Line Type 2: HTTP
Gateway IP 2: 216.155.165.50
Port 2: 8080
Timeout: 5 minutes (you can make it more if you like)
Speed 1: 9600
Line 1: ISDN
Speed 2: 9600
Line 2: ISDN
GPRS APN: wap.voicestream.com
Edit:
Ok ignore this part. This is from my other post and is for someone who is putting this info on a stock moto phone. You already have all the MMS stuff since you are using the stock flex.
Ok for multi-media messages you need to make another entry. Name it MMS (or something else if you'd like).
Homepage:
http://wap.myvoicestream.com
Service Line Type 1: WAP
Gateway IP 1: 216.155.165.50
Port 1: 9201
Service Line Type 2: WAP
Gateway IP 2: 216.155.165.51
Port 2: 9201
DNS 1: 216.155.175.40
DNS 2: 216.155.175.170
Timeout: 15 minutes (you can make it less if you like)
Speed 1: 9600
Line 1: ISDN
Speed 2: 9600
Line 2: ISDN
GPRS APN: wap.voicestream.com
Now go into your text message menu. Hit the menu button. Scroll to Message Setup and click it. Now click MMS Message Setup and Scroll to Server info. Delete any server info that is there. Add in your new server info which is:
Server Name: MMS
Server Name address:
http://wap.myvoicestream.com
Web Session Name: MMS (if you named your MMS entry something other than MMS like I suggested then type that here instead)