Keeping Your Phone and Internet Alive Through a Blackout

In a city outage your phone is your radio, map, torch, bank and contact list. Treated normally it lasts six hours. Treated deliberately it lasts three days — and the difference is a handful of settings you should change tonight, not during the emergency.

Why a phone plan matters more than a bigger battery

Networks degrade before they fail: data slows, calls fail, texts still get through. The winning strategy is not more power, it is less demand — a phone in low-power mode with the screen dark uses a fraction of what a normal one does.

What you need

• A 20,000mAh powerbank, charged and stored with your torch
• A folding solar panel if outages where you live last more than a day
• Offline maps of your city and a written list of key phone numbers
• One nominated "comms phone" for the household; the rest switched off

Stretch the battery

1. 01

   Nominate one phone. Everyone else powers down completely. Four phones on standby drain four batteries for one job.

2. 02

   Low-power mode, minimum brightness, dark screen. Turn off background refresh, location and push notifications.

3. 03

   Aeroplane mode with periodic check-ins. Come online for five minutes every hour rather than staying connected while the network hunts for signal — searching for a lost signal is the single biggest drain there is.

4. 04

   Text, do not call. SMS uses a sliver of the bandwidth and queues until it gets through. Agree a check-in time with family instead of calling repeatedly.

5. 05

   Download before you need it. Offline maps, key documents, and a note with addresses, medical details and numbers you do not know by heart.

6. 06

   Charge in the daylight. A folding solar panel on a windowsill will refill a powerbank over a day and turns a three-day limit into an indefinite one.

The mistakes that cost people contact

• Using the phone as a torch
• Leaving the phone hunting for signal in a dead zone
• Storing every number only in the cloud
• Having one powerbank and never checking it is charged

Common questions

Do mobile masts work in a blackout? Most have four to eight hours of battery backup. After that coverage thins to the sites with generators, which is exactly when SMS beats calling.

Is a car charger enough? It works, but only if the car has fuel and you are willing to sit in it. A powerbank plus solar is cheaper and does not need a full tank.

Where kit is worth the money

A good powerbank and a small folding solar panel are the cheapest insurance you can buy against being cut off from information and family. That combination has no downside — it charges your gear on every camping trip and every long journey between now and the day you actually need it.