i use mine to remote into customers systems and do repairs when needed, look up stuff on the net when im bored and out and about. i also use mine for emergency work calls and emails, im on call pretty much 24/7 for what i do.
but unless you have the need for one, i can see dropping the data plan and having a regular phone again. as for the enV3, my daughter has one, its a second line on my account. i dont pay the 9.95 fee tho, its pay per use so far. im hoping they dont force me to change that later on, its not worth the 10 dollar data fee with that browser. also, they changed the rules for vcast browsing. it now costs against your data use to browse for songs, ringtones and apps.