I am pretty travel smart, however; I got caught last night! There is a nice tram service that is used to travel to all the touristy spots...the tram travels from Kabatzh to Zeytunbrner. This takes you via Sultanhamet/Blue Mosque area.
I boarded on Sunday evening at about 21:00 at Sultanhamet. It was VERY busy..very crowded. Lots of pushing and shoving.
About 4 stops from where I boarded, I noticed that my pocket was picked clean!
I usually lock my valuables in my back pack, but I was tired and neglected to do so. Consequently, I lost just a little cash, but all my credit cards and some personal ID.
I went to the local police and they were of NO help. There is a Tourist Police station adjacent to Aya Sophia. They wouldn't take a report, didn't want my name and told me.....'You should be more careful!" So...the local police don't really care.
I learned a good lesson. Please be careful here in Istanbul.