Turkish airlines' customer service number is 0800 (11) 3371-9600 and is available 24 hours a day, 7 days a week. By calling this number you will be able to speak with a representative who will help you with whatever you need.
If you are not in usa and need to speak with an attendant, go to the Turkish airlines website and by clicking on “Contact” you will be able to find the customer service number in the various countries where Turkish airlines flies.
Other ways to contact Turkish airlines
In addition to the Turkish Airlines phone number you can still get in touch using other means, some of these means are:
Live chat: You can also speak with an agent via live chat and have the answer to your questions, to speak with an agent via live chat you only need to access their website and on the contact page you will see the option to speak with an agent via live chat.
Social networks: Another way I can get in touch with Turkish Airlines is social networks, on social networks like facebook, twitter you can talk to an attendant via messages.