My AT&T Pre 3 does NOT get data using my GoPhone SIM ($50 unlimited plan). It works just fine with my UK Unlocked Pre 3. Weird. I unlocked my AT&T Pre 3 and data still does not work.
BUT...if I tried another GoPhone SIM I would not be surprised if the data did work...
Sorry, seems kind of random. Sort of like, "You mileage may vary..."
I *was* able to get my AT&T Pre3 to work with the $10 unlimited data on a post-paid plan. Go figure.
So now I have a Sprint Pre Plus, a UK unlocked Pre 3 w/ a GoPhone SIM, and an unlocked AT&T Pre 3 (actually 2) on a post paid plan. What has this HP-canceling-WebOS-hardware fiasco done to me?!? I've become completely irrational and have spent more $$ than if they had officially launched the phone! (I probably wouldn't even have gotten it on AT&T!)