UK government to test emergency alert system on 23rd April 1500 BST
UK government to test emergency alert system on 23rd April, unless you acknowledge you will not able to use your cell, so if you are in the UK I suggest disabling the function in Settings.
Apart from the privacy concerns, i.e. you do not know what information is sent when you acknowledge the alert; when the government deems it has a sufficient percentage of the population responding, they will turn off existing alert platforms on Long and Medium Wave, these being receive only preserve your privacy and location data.