Android Secret Code: 3G Only

Android has a setting to force only use 2G to save battery, but do not always have a settingto force the use of 3G data channel to speed up data. So the only option that gives a chance only if you selected 2G and 2G Preferred otherwise.But thankfully Android provides a special code for a hidden setting that can force 3G only.
1. enter *#*#4636#*#* in phone dialer

2. select phone information

3. Preferred sets the network type to WCDMA change the default settings only

and
4. A few moments later notification data signal changes from 2G/EDGE to 3G or HSPDA if available


Testing this page on samsung spica with Éclair already on rooting. Users also havemenkonfirm nexus one that is also there. So I think there is in almost all the android phone.