Try these and see if they work:
Non T-Mobile phones
The T-Mobile Internet and picture messaging (MMS) settings for unsupported devices are being provided here as a courtesy. There is no guarantee these settings will make an unsupported device fully functional on the T-Mobile network. Customer Care cannot assist further with unsupported device configuration.
Note: Read the disclaimer and notes on unsupported handsets, devices, and software for additional information.
Preferred Settings:
Internet and Picture Messaging:
Access Point Name (APN): epc.tmobile.com
MMSC Server: mms.msg.eng.t-mobile.com/mms/wapenc
Homepage:
http://wap.t-zones.com
Short Message Service (SMS)
SMS Email:10digitmobile@tmomail.net
SMS center: +12063130004
Email center: 500
Voicemail : +18056377243 (1-805-MESSAGE)
Alternate settings :
Internet and Picture Messaging:
Access Point Name (APN): internet2.voicestream.com
VPN Access Point Name (APN): internet3.voicestream.com
WAP & MMS IP and Proxy Address: 216.155.165.050
Gateway: (port 9201)
Proxy: (port 8080)
MMSC Server:
http://216.155.174.84/servlets/mms
Homepage:
myvoicestream.com OR
http://wap.t-zones.com OR
http://wap.t-zones.com/