It had an OTA update and nothing worked after that. Fortunately a reboot cured it. Seems these companies think that's OK?
since I bought my S3, I had a notification about firm ware update, today I made that update, but when it turns on, can`t register to any network and I can`t find any available network, I made SIM swap to my own SIM, but still the same problem, I`m using now another mobile with the same SIM, any advice???