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Short answer: 3–5 GB covers a week in Germany. City coverage is strong. The famous weak point is the railway: long stretches of Deutsche Bahn routes still lose signal, so download anything you need before a long journey.
Why an eSIM for Germany
German prepaid SIMs require identity verification, often by video call or at a shop counter, which is a poor use of a first afternoon in Berlin. A travel eSIM is installed before departure and needs nothing on arrival.
- No identity verification process to complete in German.
- Your home number stays active for SMS codes.
- It works the moment you land, including for the ticket machine at the airport station.
See live Germany plans and prices
How much data?
- Maps, messaging, tickets — 1–2 GB a week.
- Normal trip — 3–5 GB a week.
- Trade fair, conference or remote work — 10–20 GB. Conference Wi-Fi is famously oversubscribed, and having your own data at Messe Frankfurt or Munich is worth the extra gigabytes.
Coverage, including the railway problem
Telekom, Vodafone and O2 have improved German coverage substantially, and the cities are excellent. The countryside and the rail corridors lag.
- Berlin, Munich, Hamburg, Frankfurt, Cologne — dense 4G and broad 5G, including most U-Bahn and S-Bahn stations.
- Autobahns — generally fine, with gaps in forested and hilly stretches.
- Deutsche Bahn long-distance routes — the known weak point. ICE trains carry onboard Wi-Fi that varies from decent to useless, and the mobile signal along the track drops repeatedly. Download before you board; do not plan a video call on a Hamburg–Munich run.
- Bavarian Alps, the Black Forest, the Harz — fine in the towns, patchy in the valleys and on trails.
- Rural east and north — improving, still thinner than the west.
The German habit worth copying: download offline maps, tickets, podcasts and anything you intend to read before getting on a train. It is not pessimism, it is experience.
Setting it up
- Check eSIM support and that the phone is unlocked. Check your device
- Install at home on Wi-Fi with the line off.
- On landing, turn the line on and enable data roaming for that line only.
- Turn mobile data off on the home line.
Full step-by-step install guide
Germany plan or Europe plan?
Germany borders nine countries and is the natural hub for a multi-country trip. If your itinerary includes Prague, Amsterdam, Vienna or Zurich, compare a regional plan first — it usually costs less than two national plans and there is nothing to switch at the border.
Check the country list for Switzerland, which some regional plans exclude.
Frequently asked questions
Is mobile internet good in Germany?
In the cities, yes — 4G is dense and 5G is widespread. Rural coverage and the railway corridors are noticeably weaker than in France or Spain, which is a long-standing German infrastructure complaint rather than anything to do with your SIM.
Will my eSIM work on an ICE train?
Intermittently. Expect repeated dropouts on long-distance routes. Onboard Wi-Fi is available on ICE services and is better than nothing. Download in advance.
Do I need to register an eSIM in Germany?
No. Germany's identity-verification requirement applies to German prepaid SIM cards. A travel eSIM roams as a visitor and needs no registration.
Does a Germany eSIM work at Oktoberfest?
Yes, and you will want your own data — the Theresienwiese is one of the most congested pieces of network in Europe for two weeks a year. Agree a meeting point in advance anyway.
How do I avoid using up data on photo backup?
Turn off automatic cloud backup over mobile data in your phone's settings, and let it run on hotel Wi-Fi at night. This one setting is the difference between 3 GB and 15 GB for most travellers.