What if your teenager's phone dies when they need you?

Why a dead phone feels scarier than it used to

A generation ago, children knew their home number because they dialled it every day. Now every number lives inside the phone. When the battery hits zero, your teenager still has their friends, their bus pass and their common sense, but they have lost every way of reaching you. Most of the time the phone has simply died and they are fine. The worry comes from not knowing, and from them having no way to tell you.

Three things to sort out before it happens

1. Learn one number by heartIt is still worth it. Practise one adult's number together until they can say it without thinking. Stress makes memory unreliable, so treat this as the first line, not the only one.
2. Agree a planWhere to go and who to ask if their phone dies: a friend's parent, a shop assistant, staff at the station. Knowing what to say makes asking a stranger for a phone much easier.
3. Set up a backup way to reach youThis is the part ZeroPercent does. It takes about two minutes, and then it is there whenever they need it.

How ZeroPercent works

1. They borrow any phoneA friend's, a shop assistant's, anyone nearby. ZeroPercent teaches them exactly what to say when they ask.
2. They open zeropercentapp.comIn any browser, on any phone. They sign in with three things they already know: their mobile number, their date of birth and their PIN.
3. They reach youTheir backup contacts are there by name, no number needed. They text you, or call you on Pro, and your replies come back on the borrowed phone. Nothing stays on that phone afterwards.

What you see, and what you never see

If you are one of the adults who run your family on ZeroPercent, you see a short, complete list for each person:

• their latest battery percentage, with an honest timestamp
• whether ZeroPercent is set up and ready
• how many backup contacts they have (the count only, never who they are)

You never see location, messages, browsing or app activity. Only the adults who run a family see battery levels.

Low-battery alerts and Check now

When someone's phone runs low, you get a heads-up, first at 20%, 15% or 10% (you choose in Settings), so you can send a quick "charge your phone". The alert has Call and Text buttons that open your own Phone and Messages apps. Once their phone is on 30% or less and stops reporting, ZeroPercent asks it for a fresh reading, even in Low Power Mode, and tells you if it goes quiet, has probably died, or is back on or charging. You can also tap Check now on their row. Their phone shows them every check. A phone that is off or out of signal can't answer, so every reading shows how old it is. All of this needs ZeroPercent 1.0.8 or later on their iPhone with notifications on, because a browser can't report battery.

How this is different from Life360 and Find My

Life360 and Find My show you where a phone is. That helps while the phone is on, but a phone at 0% stops reporting, so the location you see is wherever it last was. ZeroPercent does something else: it gives your teenager a way to reach you when their phone is off. It never tracks location, so plenty of families use it alongside a location app, and plenty use it instead of one.

Phone lost or stolen rather than dead? Read what to do if their phone is lost or stolen.

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