Problem with my S8

[UmaarB]

I have been using my S8+ on tmobile fine for weeks. I recently put my sim into a blacklisted iphone 6 not knowing it being black listed. Now when I put it back into the S8 it says "no sim" factory reset my s8 still not reading. I bought a new sim and activated it to tmobile still wont work. My sister has tmobile and I put her into the S8 and it works fine. How would I fix this?

 

[H3aTeRzz]

Did you try putting your sim card in your sisters' phone? Did it work? If not, then your issue needs to be addressed with TMobile, as they probably have you locked out, due to your sim being put into the blacklisted device. (that's my guess).