Telephone numbers in Turkey went from six (2+4) to seven digits (3+4) local phone numbers c.1988, at which time Ankara went from 41 to 4. There used to be more than 5,000 local area codes of varying lengths (one to five digits) with correspondingly varying local number lengths (seven to three digits). The new system is based on 3 three-digit area codes for provinces and seven digit local phone numbers. Istanbul is the exception and it gets two area codes ([212] for the European and [216] for the Asian side).