I had to physically go to a store where they needed BOTH of our passports and a second form of ID (so had to go back to the hotel and return with my traveling companion) and a decent 30 minute process of entering our information into databases and making copies of IDs. Compare that to most countries where I can either trivially pop into a local store and pick up a prepaid sim in a few minutes, or, for most of my travel I can have them shipped to me at home in advance so I can land in country with a local sim.
Istanbul was worth it though.