Iphone 5S on 02 will it work in South Korea?

I'm off to South Korea will my iphone 5S work there? I'm on 02?
I have heard rumours they don't have the same frequency.
I will be turning off my data roaming and 3G/4G as I don't want to be charged a fortune on my return.

Any ideas?

Yes, it will.

BUT… Be warned… Make sure you definitely turn off data roaming. O2 UK will use a different network in South Korea as you're not in the UK and it will cost a fortune.

o2.co.uk/international says it will cost…

- £40 for just 50MB of internet data (that's enough to put about 10 pictures on facebook? - basically, don't! Use Wi-Fi there)

- £1.50 a minute to make calls - and £1.25 a minute to receive.

- 40p per text message

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