You don't say which country's T-Mobile you're talking about. I couldn't get it working with T-Mobile USA, then I realized what the problem was: I had defined my own DNS servers in my T-Mobile Internet access point. After I changed them to auto, it works! These are the settings I use in fMMS: Access point name: wap.voicestream.com Username: Password: Proxy: 216.155.165.50 Proxy port: 8080 MMSC: http://216.155.174.84/servlets/mms