I didn't remove my sim card before trade in my iphone to at&t?

I trade in my old iphone 4 to at&t today and I forgot that my sim card is still in there! I erase all the contents and settings on the phone though. The guy there didn't say anything about it, but I change my phone number, so does this has anything to do with it? Can at&t do anything with it?

Please answer these questions! I'm worry about it so much right now!

They will wipe the phone you will not get a sim card from your iphone hope this helps.