If someone steals an iphone from gamestop can they sell it at a different gamestop?

Ok so I'm not asking for me omg ;-; but there's a guy that's stolen three iPhones from three different gamestops and we're supposed to be on the lookout for him. I was just wondering if he brought one of the iPhones in to sell it is there a way we would know it was one of the stolen ones? Like the guy took them from the front before we even had a chance to inventory them. I don't know how if there's a serial number gamestop tracks them on or what?

What would happen if I tried to use a locked iPhone with a different SIM card?

I want an iPhone. And I'm thinking of buying one on Amazon.com. I was looking, and one that is "locked" is much cheaper than one that is "unlocked." I was wondering that if I bought this and put a Straight Talk SIM card in a locked Verizon phone, would it work or not? And if not, is there any way that I could get it to?

Why can't I delete music on my IPhone?

I have an IPhone 4S and for some unknown reason, I can't delete certain music. I can delete some, but it won't let me delete others. I recently downloaded the IOS 7, so could that be causing the problems?

IPhone keyboard not working?

I have an iPhone 3GS and for the past few days the keyboard has been really sluggish and typing things wrong. Sometimes I have to press keys quite a few timed to get them to type (especially the space bar). I've had my phone for about 2 years now and I've never had any problems before. I haven't got the money to get it fixed but is there anything I can do?

My itunes won't load properly?

On my iphone 4s when i click on itunes it loads for like a second then goes back to the home screen, i have re-synced it, turned it on and off and it still is messing up?