Debe ser esto lo que está sucediendo...
Apple Launches Official Repair Program for iPhone 7 Models Affected by 'No Service' Issue
https://www.macrumors.com/2018/02/02/apple-iphone-7-no-service-repair-program/
Apple Launches Official Repair Program for iPhone 7 Models Affected by 'No Service' Issue
https://www.macrumors.com/2018/02/02/apple-iphone-7-no-service-repair-program/