Motorola backflip not connecting to my data plan.?

[BlackVista]

I just got the phone and have been trying to set it up all day, I double checked to make sure i had set it up right and even tried resetting it up. I use At&t and have a full data plan, which was working on the phone that i switched from before using the backflip earlier this morning. Has anyone else had this problem and fixed it? or have any possible solutions?

thanks much!
My old phone was an Android