Android market seems to be disabled by default on Samsung Galaxy mobile phones in the Middle East, and Samsung is using their marketplace instead, which is totally ridiculous.

To enable the Android market (Tested successfully on Samsung Galaxy S9000)

1. BACKUP all your data
2. Get your IMEI by calling *#06#
3. Call the following: *#272*IMEI#*
4. Choose “XSG” and then “Install”
5. Your mobile will reboot, and you’ll find the Android Market enabled.
6. Enjoy!

Sources:

• http://kovshenin.com/archives/samsung-galaxy-ace-getting-the-android-market-to-work-in-turkey-more/
• http://androidforums.com/samsung-galaxy-ace/296040-samsung-ace-android-market-not-pre-installed.html