OP3 4G Compatibility - Pakistan (North America Version)

Hey guys.
I am from Pakistan, and I am gonna buy a OP3 soon. At first, I thought of buying from China, I changed that decision when I got to know the software was different in that variant (according to a video). I want to buy the North America version, but I wanted to know, will the 4G-LTE work in Pakistan? My carrier is Warid (The company doesn't have 3G but 4G only), and it has 1800MHz FDD-LTE bands, if I'm correct.

Can anybody confirm, that the 4G will work on the device in Pakistan? I'd be really grateful.
Thanks.

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