I got my iphone stolen, what do they do with it?

Yeah they sell it, but it had a passcode lock on it how do they get past that and do they look into your personal details? I *** hope not haha

Phone your network company and get the phone shut down

Well anyone with any sense contacts their provider and gets the phone permanently blocked.

If they know how to jailbreak, or know how to use any technique to get into the phone using a computer, then they can. But that is very unlikely considering they stole it, they probably don't want to figure out everything about you. And plus it would take a lot of work on their part to be able to even do that, cause its an iPhone. So the chances of them doing that are extremely slim. They can't sell it either, so if you haven't yet, call your carrier and see if they can brick your phone from their end. You might be able to get it tracked too, and then take it back

If it's contract, and the sim isn't locked they can make a lot of calls on your account. Remember the sim can easily be put in another phone. If it's pay 'n go then you lose your credit.
In either case tell your provider as soon as possible