heres what just happened to me. earlier i went into SETTINGS>ABOUT PHONE>NETWORK and under MOBILE NETWORK TYPE it read HSDPA. about an hour ago, my internet completely stopped working. this happened when i first bought the phone because by accident they took me off my unlimited data plan and for the time being they put me on the $25 one that entitles me to 2gb...and it started to work. it worked fine up until about an hour ago. i called att and they dont know why my internet connection stopped working but they got it back up and also put me back under my $30 unlimited plan. the thing is though that now when i check my phones network settings, it now says UMTS. is this slower than HSDPA? what is the difference between the 2? i dont really notice much of a difference, if anything it is a little faster but it could just be in my head. any help or info on this?