Buying Iphone locked vs contract free?

Buying Iphone locked vs contract free?

Added (1). will I be forced to have certain plan from AT&T if I take one with contract from them, or I will be free to choose the plan but to be with them for the next two years?

And if I take a plan from them, will it be at the same price to other people who have their unlocked iphone or will it be higher?

And after the two years, can I use the Iphone with and other carrier or not?

You could check their website & see the plan options. Prices should be the same.

I would get on contract, your carrier will unlock it when contract is done.