Silent mode and Do Not Disturb: what can change an alert
Silent mode, Do Not Disturb, volume and permission do different jobs: check the real device and prepare a backup channel.
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Practical setup
Concrete steps to set up a phone, contacts and reminders before you actually need them.
Set up the phone, notifications and actions so they are understandable, then practise the route with its user.
Useful errors: known status and next action
A network, permission, or recipient error should separate certainty from doubt and offer one concrete next step.
Read the guideWhatsApp pinned message or visible safety actions? — separate clarification of this choice’s purpose 2.
Decide whether the need is retrieving instructions or starting a defined action. Context and individual ability may change the choice.
Read the guideWhen internet is down: what remains of WhatsApp, Telegram and a safety app
What remains without internet: shared dependencies, calls and SMS when available, a paper contact card, agreed checks and limits.
Read the guideDelivered, read, understood, acknowledged: four different things
Delivered, read, understood and acknowledged are four different states. Ask for explicit ownership and prepare a backup channel.
Read the guideDo fewer steps always mean more safety? Not quite
Speed, confirmation and error prevention: when a direct action helps and when SOS needs confirmation and a countdown.
Read the guideOne decision per screen: progressive disclosure
A readable flow separates choice, recipients, review, and sending without hiding costs, consequences, or alternatives.
Read the guideReduced vision: contrast, text, and icons in a safety app
Contrast, scalable text, labelled icons, non-colour cues, screen reader, and focus need practical testing.
Read the guideTremor and low dexterity: design a touchable safety action
Hit areas, spacing, cancellation, and practical testing help without diagnosis or a guarantee of accessibility.
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