How To Configure T-Mobile EDGE Internet Settings on 4.0 - iPhone 4

This video shows you how to configure your T-Mobile EDGE Data Internet Settings on firmware 4.0 (iOS4) on any iPhone: iPhone 2G, iPhone 3G, iPhone 3GS, and iPhone 4. This also works on previous firmware versions.

Go to Settings: General, Network, Cellular Data Network and add the following to the APN field: wap.voicestream.com or internet2.voicestream.com
or epc.tmobile.com

Leave username and password blank.

Note: You may need to restart your phone after entering these settings.