Should the deposit on a new phone contract decrease in price if you have credit?

i'm a recent highschool graduate and i want to get a cell phone contract. i'm currently on my parent's plan, but they're paying month to month, rather than extending their contract. so my phone could go off anytime, you know? anyways, i'm concerned about how expensive the deposit might be. if i had a good credit score (i don't have credit) would the price be more reasonable?

i'm looking at at&t, if that helps any.

AT&T can give you the best of idea of deposits.

You need to ask them for the answer.