To call a city in Turkey you must first dial the Turkey country code 90 then + one of these area codes and the phone number
Sample = If you want to call a number in Izmir => 0090 + 232 ( Izmir area code) + phone number
If you are going to dial a mobile phone 3 companies are available. Turkcell , Wodafone and Avea
All mobile (cell ) phone numbers start with number " 5 "
Turkcell extensions start with 53 ends at 539 (531) (532)....(539) calling 0090 (532)- number
Telsim extensions start with 54 ends at 549 calling 0090 - ( 541) - number
Avea extensions vary from 501 to 505 , 551 to 557 calling 0090 (501) - number
Below is the Area codes for Turkey indicated.