Recently upgrading from 4.5.3A to 4.5.4.1A and started the problems.
I start phone and it see the sim and the right operator , but there is no signal ( the x near the signal value), wait to take the signal but nothing to do, ceck the network operator and it’s searching for a lot of time( from 5 to 10 minutes) and when finally find it I click on my operator and i take other more time to register with error.Sometime it register but no internet data.I tried more methods
but nothing