How to use my iPhone 5 in another country?

I have an iPhone 5 and I'm going to turkey. How can I use it there what do you have to do in order to use it there. Also my phone is with FIdo

Get it factory unlocked and you can use the phone on any GSM carrier worldwide. Buy a Turkish SIM when you reach Turkey, trim it to nano SIM and use it in your iPhone 5. That's all. You can mail this person (arghyle@rocketmail.com) who can help you get your iPhone factory unlocked.

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