in the UK we always had GSM/WCDMA even if the phone was running in HSDPA, and since most of you root onto the generic UK firmware that is your answer.
Xperia X10 (Traded In) > Xperia Arc (Dev Handset) + Xperia Ray (Back-up Phone) > Xperia Arc S (Retired) > Xperia S (Retired) > Xperia T (Retired) > Xperia Z (Current)
Xperia Tablet S (Current)
Developed the Dark10 series (X10 + Arc/Ray/Arc S)
Helped in development of Timescape mod's (X10)
Helped in Graphical development of FXP ICS (Arc/Ray/Arc S)