The government is rolling out a new Emergency Alerts system, designed to warn people about emergency situations (such as extreme flooding).
The system will be tested at 3pm on Sunday 23 April, with alerts being sent to mobile phones accompanied by a loud noise, even if your phone is on silent.
If you are living with an abuser, an alert could put you at risk because it might let your abuser know you have another separate or secret phone.
Refuge has put together a video to show you how to disable the emergency alerts, with versions for both Apple and Android devices.