Stolen iphone 4s and has a passcode

Hi so last night i lost my iphone 4s and it has a passcode, i have my pictures and my emails and everything personal on that phone, i'm afraid that the thief will have access to my phone and get all my info, is there anyway to do that, once i'm back to the states i'm going to report that iphone, so they can't use it as a phone but i don't hqve the serial number,
oh one more thing i can't track down my iphone thru icloud, cuz the phone has no internet connection! What if they restore the iphone to factory settings, will they be able to get access to my info please help

If you don't have imei serial key then report for your contact no. To cust.care from other no.about been stolen your mobile, they will tell you IMEI serial number then you can track your iphone…