A few week ago, i traveling to Istanbul, Turkey from Kuala Lumpur Airport, Malaysia. When i'm arrived in Ataturk Airport, Istanbul, as usual, firstable i try to find free wifi at Ataturk Airport, Istanbul. I need the internet connection for Whatsapp my friend, to give information that im already arrived in Istanbul Airport.
When i try to activated the wifi, there is a free wifi from Turk Telekom, but the system is not an direct free wifi, not like Kuala Lumpur Airport. In Kuala Lumpur Airport you can use direct free wifi for 24 hours.
You can use free wifi in Istanbul Airport if you have Turkish number. You have to fill your data, Turkish phone number (I not sure about this, that must be Turkish number, because i see someone from Kazakhstan, he can get sms and connect free wifi. But when i try Indonesian number, cannot connect) and you will get the sms for the username and password.
You can use for two hours free wifi. Or try the other way, like borrow someone phone who connect to free wifi, but that way sometime works, some not, depend the person because its too risky and disturb other people privacy if you borrow other person phone.
Happy traveling...:)