I want to switch my Iphone service from AT&T to Net10.any one else done this?

I don't even know the first step involved. I know with AT&T the cancellation fee is $325.00 minus like 10 dollars every month you have had service. But what I'm questioning is, how do I go about just completely switching services? Do I have to cancel my service first? Does my phone have to be unlocked? Etc.

Yes for you to use your AT&T device on another provider you have to unlock it first, if you cancell the service you have to pay for the cancellation fee or whatever your penalty is, all you need to do is unlock your phone and go to the new company and sign up with them and notify your current provider that you want to cancel.