I bought an Avea Sim at Ataturk airport on Saturday 12/22. The clerk took a copy of my passport and registered the SIM, but never asked for the IMEI of my iPhone. He told me to wait 30 minutes - I followed all the directions he gave me and was able to activate the voice and data, but the data didn't actually work until I had a clerk in another Avea store on Istiklal change a setting for me.