Hero gives DATA CALL FAILURE boxes and I can't register with gmail!! What is going on

[doodlebug1]

The Hero has turned out to be a huge DUD.

By the 2nd week of ownership, after being unable to register with the Market, I started to get numerous Data Call Failure boxes daily, even tho the rest of my phone was working.

I then called Sprint. Was finally told to do a factory reset....and though I can still receive phone calls, I can do NOTHING with my phone--cannot register my gmail account, have no home page, have lost everything, and still get those dang boxes.

And when I try to log in with my gmail, I get a registration failure notice that says "this could be a temporary problem or your phone may not be provisioned for data services" Huh???

Is there any brilliant individual out there who can give me a kindergarten step-by-step answer to this ridiculous problem??