I have a problem with my iPhone. It`s with 1.1.1. I unlocked the phone and it was working for 2 moths. And one day, I received a massage from the phone: This network is not available, try another network. And the phone does work. I can`t make calls. I pre-install the phone a couple times, but the same. It`s working for 1 day and then the same message. Where was the operator logo, there is wrote: no service. Any idea ?