"NO SIM, or SIM ERROR" is noted in red on my 2nd hand Sprint provider phone.
Voicemail - Call or Message are the only choices that come up on the phone.
I am Canadian who bought on Ebay a Samsung Galaxy S6 LTE and the home company is Sprint from United States. Everything else seems to be working right now but the when a call goes to the cell, it goes strictly to a voicemail that is not retrievable.
The phone does not show as the Youtube video https://www.youtube.com/watch?v=b_7Gvl1XVkY
The green screen on this video does not even come up on the phone.