Can a blocked iphone 5s be used outside of US?

Two months ago I purchased an iphone 5s from craigslist. It was brand new, in a tmobile box. Now two months later, I lost service in my phone and it turns out that the person whom I got it from scammed me. I contacted the person, but i got no response. My only option is to switch my phone with someone I know who is moving to a different country… But I want to know if my phone will work in a different country if its blocked by tmobile in the US?
(I believe The phone was unlocked)

Icloud lock it doesn't matter if you are in the US or not. Blacklisted I think it matters what carrier.

I don't think it can be used outside US without getting it unblocked. If you can get it unblocked, you can use it yourself too. If you need help with your issue, mail me for more info.

A blocked iPhone can't be activated anywhere in the world. That's because apple knows lots of stolen phones were being sent overseas
So it can't be used anywhere in the world