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?