If you have a secret phone, you'll need to turn off the emergency alert notifications before Sunday, April 23.
If you're trying to leave a domestic abuse situation, buying a new, secret phone that your partner can't check through is often one of the first steps. This can help you to get in contact with charities and a support network, and begin to make plans to leave without alerting your partner and potentially putting yourself in danger.
On Sunday, April 23, the government will send out an emergency alert notification to all phones in the UK to test the system. These could be used in the future to alert people if there's a danger to them nearby, but it could also draw attention to a secret phone.