hi. I'm using samsung galaxy s3.it was good until few days ago it start showing a problem. Whenever i try to call someone it says ''not reigstered on network''. I tried to turn it off used other sim but the same problem exist. Then i tried to update its software but the message appears ''Your device have been modified, Software updates are not available'' please help me. What i am supposed to do? I heard of some flash software of samsung but i don't exactly know what to do. Please help me
Read more: Samsung galaxy s3 ''not registered on network'' problem?