# Prepare your phone to be useful when the network is not

Canonical: https://romeoapps.app/en/surv/offline-emergency-preparation/
Author: Roméo Gambino · Published: 2026-09-05 · App: Surv (https://romeoapps.app/en/surv/)

What survives a network outage, why text beats calls when everyone is dialling, how to keep documents readable offline, and how to make a phone last when there is nothing to charge it with.

## The failure people do not plan for

Most emergency planning assumes the phone works. Ready.gov puts the problem plainly: technology has made it easier than ever to prepare for emergencies, but it can be unreliable in an emergency if you have not kept your devices protected and powered up. The two failures are separate. The network can fail while your phone is fine, and your phone can die while the network is fine. Prepare for both.

## Anything that loads from a server is not available

This is the test to apply to every app on your phone: if the network is down, does this still show me something? A cloud notes app with no local cache shows nothing. A map that streams tiles shows nothing. A checklist that syncs on open shows nothing. The apps that remain useful are the ones that keep their data on the device, and you cannot find out which those are during the emergency.

## Test it the only way that works

Turn on airplane mode and open the apps you were counting on. That is the whole test, it takes two minutes, and it is more informative than any amount of reading. Do it once a year alongside the kit review. Most people discover at least one app that they assumed was offline and is not.

## Text messages beat phone calls when networks are strained

Ready.gov's reasoning is technical and worth knowing: mobile networks can become overwhelmed during emergencies, making it hard to make and receive calls, while text messages require less bandwidth and are transmitted more reliably when many people are using their phones at once. The instinct in a crisis is to call. The more likely thing to get through is a text.

## Set up the contact paths before you need them

Keep contacts updated and synced across phone, email and social media, so you can reach the right people quickly. Create a group chat or a thread for family, friends or colleagues before anything happens, because assembling one during an emergency wastes the window when messages still get through. Ready.gov also suggests a group list of your top contacts.

## Alerts have to be arranged in advance

Sign up for the alerting services relevant to where you live, and follow local government accounts, before a disaster rather than during one. In the United States, the FEMA app carries National Weather Service alerts for several locations, and FEMA text messages work by texting keywords to a short code. Whatever the local equivalent is where you are, the point is identical: the subscription has to exist beforehand.

## Power is the constraint that ends everything

A phone with no battery is not a partially working phone. Ready.gov's advice is to charge all devices fully before severe weather, keep a backup power source on hand, and keep a portable charger in the car at all times. A battery pack that lives in a drawer and is discharged is not a backup, so charge it on the same schedule as you check the kit.

## Make the battery last once the power is out

If the power goes out, minimise device use to save battery. Switch to low power mode, or airplane mode when you do not need the network, since searching for an unavailable signal is one of the fastest ways to drain a phone. Lower the screen brightness. These measures sound small and they change the number of hours you have.

## Documents you can actually open

Store important documents on a secure, password-protected drive or in the cloud, and use your phone's camera to capture insurance policies, identification and medical records. The offline caveat matters: a document that exists only in the cloud is unavailable exactly when the network is. Keep a downloaded copy on the device as well, and include your pet's information.

## Paper is not obsolete

Some things belong on paper regardless of how good your phone setup is: the address of where you would go, a handful of phone numbers, and any medical information someone else might need if you cannot speak. Ready.gov includes local maps in the basic supply list for the same reason. A folded sheet in the kit needs no charge and no signal.

## Consider what a stranger could see

A phone that is your emergency reference may be handled by someone else, or read from a lock screen. Medical information that helps a responder is worth making accessible. Everything else is worth keeping behind the lock. The balance is personal, but making it deliberately beats discovering it by accident.

## Keep the phone reachable and protected

A device that is charging in another room when you leave the house is not part of your kit. Decide where it lives, and keep the case and screen in a condition that survives being dropped in a hurry. The most sophisticated preparation is undone by a phone left behind on a counter.

## Review it with the kit

Add the phone to the annual kit review rather than treating it separately. Charge the battery pack, re-download the offline documents, confirm the alert subscriptions are still active, check that your emergency contacts are current, and run the airplane mode test. The whole pass takes ten minutes and it is the difference between a plan and an assumption.

## What Surv does offline

Surv stores your inventory on the device and works without a network connection, which is the point: an inventory you cannot open during an outage is not an inventory. It also holds expiry dates and can remind you before an item lapses. Build the list by walking through the kit physically, since the app knows nothing you have not entered.

## What no app can do

Surv is a reference tool, not an emergency service. It does not call anyone, it does not know what is happening where you are, and it does not replace the instructions of local authorities. In an emergency, follow those instructions. The value of preparation is that it removes decisions in advance, not that it substitutes for the people whose job this is.

## A pre-departure access check

In airplane mode, try to find a particular guide, your equipment list and your family plan. Record separately what opens, what is missing and what you do not understand. Reconnect to complete missing items, then repeat exactly the same route offline.
Also ask someone in your household to locate essential information and its physical backup. This checks access and understanding of your organisation; it does not certify that supplies are sufficient or that the household is prepared for every risk.

## Sources

- Ready.gov: Get tech ready — https://www.ready.gov/get-tech-ready
- Ready.gov: Alerts and warnings — https://www.ready.gov/alerts
- Ready.gov: Build a kit — https://www.ready.gov/kit