Question about ATT unlocking iPhones

[shamash]

So I have an iPhone 4, I've had it over 2 years, and I'm moving to South Korea to teach English in a month.

A few questions:

1) If I call ATT to unlock my iPhone, and unlock it and then continue ATT service for a month, will it remain unlocked?

2) After the phone is unlocked, do I just need to put in a South Korean SIM card to get it working there?

3) Does anyone know what phone companies in South Korea support the iPhone?

 

[lazard]

So I have an iPhone 4, I've had it over 2 years, and I'm moving to South Korea to teach English in a month.

A few questions:

1) If I call ATT to unlock my iPhone, and unlock it and then continue ATT service for a month, will it remain unlocked?

2) After the phone is unlocked, do I just need to put in a South Korean SIM card to get it working there?

3) Does anyone know what phone companies in South Korea support the iPhone?

1. Yes
2. Yes, just pop in the sim and activate it.
3. KT and SK

 

[shamash]

1. Yes
2. Yes, just pop in the sim and activate it.
3. KT and SK

Thanks so much~! I tried searching around and the horrible search tool was NOT very helpful I really appreciate your quick and helpful response!