Will a Canadian iPhone work in the UK?

I'm might be buying an iphone 5s/c as my new phone, unlocked from the Apple store, and want to know whether I can use my uk giffgaff SIM card with it and whether or not it will work in the UK.

If its unlocked then yes

Yah it will work but you may not be able to "LTE" Data speeds you will be able to get 3G/4G Speeds probably

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