After setting to WCDMA only..wait a while..till the radio go off and ON again..otherwise the setting wont stick.
The phone wont permanently stay at 'H' till you do data access...it will switch from 3G-> H..that is UMTS to HSPA. My phone 4.0.2 stock will stay on the setting even after reboot.
How frequent you reboot your phone ? Create a short cut to the setting with app ->AnyCut..this way you can set it back easily.
Are you having 2G<->3G jumping problem or 3G not going to H ? what are you real problem ?
ok...so it looks like maybe my firmware had problem out of the box already.
i've waited for the signal to go off and on, the setting will be there when i check again, but won't if i restart the phone. my phone doesn't switch from 3g to H. it stays at H permanently.
i sometimes reboot my phone.
not 2g<->3g jumping problem. cos my office building some areas no 3g coverage, only got 2g. when i move to an area with 3g coverage, the H shows up. i do a speedtest, and then i off and on data and do a speed test again, the speed will be double that before i off on the data. i realised its because the network doesn't go to hspa after it goes into the 3g coverage area, instead it goes to hsdpa instead, which is a slower version of 3g.
