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My iPhone 5s is showing ‘searching’ on top left of the screen. Have followed instructions such as: - reset network settings - power off and on - remove and replace sim Can access internet but can’t make calls or send SMS Currently iOS 11.4.1. Can’t upgrade to 12.1.2 because on the verify step it says I don’t have an internet connection - although I’m using it right now. Any assistance gratefully accepted.