on 24-12-2018 13:50
@Chele download Malware Bytes app from your app store and run it.
It will identify any spyware in apps which you should delete .
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
on 24-12-2018 22:20
Delete any apps you have downloaded that coincided with your problem. Sometimes simply deleting the app doesn't get rid of the spyware. Malware checkers may get rid but in extreme cases nothing short of a factory reset will help you.