Hello friends. I got a S3 bought on the Tigo carrier, but I needed it to use it on Claro carrier. The day they give the phone to me I tested my Claro Sim and since all was good I decided to buy it. And actually it worked all fine for like 2 months, then suddently I got a "Cannot Register on Network" message, while on this state I cant make/recive phone calls or SMS but oddly I still have full 3G internet with no problem. Removing battery / SIM used to solve the problem sometimes but not anymore. I tried change SIM for a new one and still the same problem. Tried hard reset aswell and didnt helped. Its weird because I used it on Claro perfectly for 2 months then this happened. If I put a Tigo SIM it works all good. =/ What do you suggest me to do? I need to use my Claro number. Thanks in advance.