National emergency test alert will be sent to all mobile devices on 27 July, with domestic violence advocates advising how to turn off safe phones

Safe phones can be a lifeline for domestic violence victims, but a nationwide test of the new AusAlert system will still sound on devices on silent or do not disturb.

Technical gremlins appear inevitable for the nationwide test of the AusAlert emergency warning system, but what they are will have to wait until July 27 at 2pm.