Hi 

I'm using z9s pro for past 8 months from the beginning im facing this issue.problem is suddenly network turn into "emergency calls only" mode then I'm swap the sim slot into another slot then working properly.in this 8 months if happened once or twice I accept that but I'm facing this problem twice or thrice a week.once visited the vivo service center but they can't find any solution.now im always carring a "sim ejector". Please provide any solution