Iphone blacklist warranty – is this iphone , badly help needed hardware issue

Hello,

I bought iphone 6 locked and blacklisted Along with O2 UK. (it was sealed, but still, imei was blacklisted)

Now i have a problem, it has screen defect, and I can get a replacement.

Question, does warranty still exists if phone is barred in UK Along with 02, but I am in other country?

Who knows 100%? I dont want to lose phone