As you may be aware on Sunday 23rd April the Government is testing an emergency alert system on all mobile phones. There is also information about protecting those with hidden phones so the alerts can be switched off, as people may have these for safety purposes, for example those suffering domestic abuse. The two links below explain what will happen, the second link has comments from the charity “Refuge” about switching the alerts off if you are in a difficult situation.
www.gov.uk/government/news/one-week-to-go-until-uk-emergency-alerts-test