Emergency Communication Without Internet: How to Stay Reachable During a Blackout

During a blackout, communication channels fail one after the other: first the landline network (VoIP requires electricity), then mobile internet, and finally the mobile network itself. What then?

Pillar / System	Primary function	Range	Wolf’s unvarnished verdict
1. Hand-crank radio (DAB+/FM)	One-way information reception (civil protection)	Nationwide / Regional	“An absolute must-have for every household. Anyone who doesn’t listen to official announcements is flying blind.”
2. PMR / Freenet radio	Two-way communication to keep your family safe in the local area	approx. 1 to 5 kilometres	“Perfect for keeping in touch with your partner or children if you have to leave the house. No registration or fees.”
3. Satellite communication	Global, self-sufficient text messages & emergency calls	Worldwide (independent of mobile phone masts)	“The absolute top-of-the-range solution. Expensive to buy, but the only real link to the outside world when all hell breaks loose.”

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What works and for how long

Communication method	Downtime	Why
Landline (analogue, old)	Days to weeks	Own power supply in the line
Landline (VoIP/IP)	Immediate	Requires a router = power
Mobile network (calls/SMS)	1–3 days	Masts have emergency power
Mobile internet	Hours to 1 day	Data load overloads network
Hand-crank radio (reception)	Unlimited	No electricity required
Amateur radio	Unlimited	Own power supply

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Method 1: Mobile phone with battery management

Keep it operational for as long as possible:

• Airplane mode when no active communication is required
• Use text messages instead of calls (less network load, higher delivery rate)
• Cache messages in offline messengers (Signal, Telegram)
• Keep your power bank fully charged as a backup

👉 Charging your mobile without mains power: The best methods →

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Method 2: Hand-crank radio — information without the frills

The hand-crank radio is the most important communication tool during a blackout. It receives radio signals — completely without electricity, without the internet, without a battery.

Public service broadcasters have their own emergency generators and continue broadcasting even during a blackout. This is where official situation reports, evacuation instructions and supply points are announced.

The best hand-crank radio also has:

• A USB port for charging your mobile phone
• Integrated torch
• A solar panel as a second charging option

👉 The best hand-crank radio in the test →

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Method 3: Pre-arranged meeting points

If all communication channels fail, a pre-arranged meeting point is the safest option.

Decide today:

• Meeting point 1: Home — when everyone is at home
• Meeting point 2: Someone you know nearby (parents, neighbour) — if you can’t be reached at home
• Meeting point 3: The other person’s school or workplace — in case no one is at home
• Time: e.g. “If we haven’t managed to contact each other after 4 hours, we’ll meet at 6 pm at…”

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Method 4: Walkie-talkie / PMR radio

PMR radios operate on fixed frequencies — without infrastructure, without a mobile network. Range: 1–5 km in the city, up to 10 km in open country.

Ideal for families who are in different parts of the city. Affordable models are available from €30–50.

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Method 5: Analogue landline

If you still have an old analogue landline (not VoIP), you can still make calls during a power cut — Telekom’s lines have their own power supply.

However: most German households have already switched to VoIP. Check whether your line is still analogue.

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The most important tip: Plan ahead of the blackout

All these methods only work if you know about them and have prepared in advance. Call your family today and draw up an emergency plan.

👉 Hand-crank radio test: Which is the most reliable? →
👉 The complete blackout checklist: Communication and more →