take your IMEI numbers with you if possible.These are the ones on the barcode on the box when you buy the phones ( you know the box that everyone throws away along with the receipts so that you can't claim on Turkish insurance!!)
When we got burgled the Jandarma wanted these numbers as apparently they can locate the culprits from them.
Of course we didn't have them, we phoned O2 and T-mobile from Turkey, but of course they wouldn't give them out, something to do with data protection GREAT !!