RoamTheWorldCellPhones.com

Cellphone GSM Frequencies: 900/1800

(This means you will need a GSM cellphone that will work on 900MHz or 1800Mhz to use it in Turkey.)

Cellular carriers for Turkey

Avea Iletisim Hizmetleri A.S.

Frequency: GSM 1800
Website: www.avea.com.tr

Coverage Map

Turkcell Iletisim Hizmetleri A.S.

Frequency: GSM 900
Website: www.turkcell.com.tr

Coverage Map

Vodafone Telekomunikasyon A.S (Vodafone Turkey)

Frequency: GSM 900
Website: www.vodafone.com.tr

Coverage Map

If you've used either of these networks or roamed in Turkey, please post about your experience and the cost. Feel free to ask questions.