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Connectivity & techBy Clever Tourists · Published
EU visitors need nothing in Germany; for almost everyone else a data eSIM is the better choice here than in most of Europe, because German prepaid SIMs must pass identity verification before they work, and the supermarket starter kits that look cheap often fail that check for non-EU passports. If you do want a German SIM, buy it in a Telekom, Vodafone or O2 shop where staff verify your passport on the spot. We spent 16 days in Germany in July 2023 (Berlin, Bremen, Frankfurt, Würzburg, Ulm and Munich), then crossed into Italy, which is the kind of multi-city rail trip where Germany's train dead zones matter more than the SIM price.
Since 2017 German law (now section 172 of the Telecommunications Act) requires every prepaid SIM to be tied to a verified identity before activation. That has practical consequences for tourists:
• In an operator shop (Telekom, Vodafone, O2), staff check your passport and the SIM works the same day. This is the reliable route.
• Supermarket and drugstore starter kits (Aldi Talk, Lidl Connect, the kits at Rossmann or dm) are not activated at the till. You verify yourself afterwards through the operator's app or a video identification call, or through Deutsche Post's PostIdent. Non-EU passports are not always accepted by the automated checks, and a failed check can leave you with a dead SIM.
• Activation can take from minutes to a day, so do not count on a German SIM working on the train from the airport.
This is the main reason an eSIM installed at home is the low-stress choice for a Germany trip under three weeks.
EU/EEA: you do not need anything. Roam Like at Home means your domestic allowance works here at no extra cost, subject to your operator's fair-use limit on cheap unlimited plans.
UK: post-Brexit, the four big networks no longer match. As of 2026 O2 still includes EU roaming at no daily charge (with a fair-use cap of about 25GB), while EE, Vodafone and Three charge a daily fee of roughly £2 to £2.75 (≈ $2.7–3.7) on most plans. Smarty, iD Mobile and Lebara include EU roaming. Check your own plan's roaming page before you go, because the fee depends on when you joined.
US and Canada: your home plan works, but usually through a paid daily pass. AT&T's International Day Pass is $12 a day for the first line (capped at 10 charges per bill), and Verizon's TravelPass is also $12 a day. On a two-week trip that is well over $100, which is the main reason Americans buy a travel eSIM.
Australia and New Zealand: home-carrier international day passes exist but are priced per day, so the same maths applies as for US travellers: anything over a few days is usually cheaper on a data eSIM or local SIM.
Germany borders nine countries. Switzerland is the one outside EU roaming, so trips to Lake Constance, the Black Forest near Basel or Konstanz can put an EU or UK phone on a Swiss network at non-EU rates. Select a German network manually in those areas.
Germany has three established networks and one newcomer. Telekom (Deutsche Telekom, prepaid sold as MagentaMobil Prepaid) has the best rural and rail coverage. Vodafone (prepaid CallYa) is second. O2 (Telefónica, also behind Blau) is often cheapest and strong in cities, weaker in the countryside. 1&1 has been building its own fourth network and relies on partners where it has no masts. Aldi Talk runs on O2; Lidl Connect runs on Vodafone.
A German prepaid SIM gives you a local number and good per-gigabyte value on a month-long stay, if you get through verification. A travel eSIM (apps such as Airalo, Yesim or Saily) is data only and works on landing at Frankfurt or Munich with no ID step. Your home carrier's day pass is simplest and costliest. Our eSIM or local SIM guide covers the general comparison.
Realistic numbers for a phone used for maps, messaging, ticket QR codes and some photo uploads: about 0.5 to 1GB a day. Add 1 to 2GB a day if you video call home, stream music on long train rides or hotspot a laptop. A one-week trip is comfortably 5 to 10GB; two weeks, 10 to 20GB.
Unlimited plans are worth it only if you will hotspot a laptop or stream video daily. Note that many "unlimited" travel eSIMs slow you down after a daily threshold, so read the fair-use line before you pick one.
Germany-specific: the DB Navigator app holds your Deutsche Bahn tickets and live connection changes, which you will check a lot given how often regional trains are delayed. Download tickets to the app on Wi-Fi so they show offline. Public transport apps such as MVV in Munich and BVG in Berlin also handle tickets and the Deutschlandticket.
A data-only eSIM covers most visitors. DB tickets, museum bookings and restaurant reservations work with your home number and email.
A German number matters for longer stays: some flat rentals, gyms, and services that verify by German SMS. If you keep your home SIM in the physical slot, banking codes still arrive; turn on Wi-Fi Calling to take calls cheaply from hotel Wi-Fi, which is near-universal in German hotels.
• Your phone must be carrier-unlocked and eSIM-compatible. Most iPhones since the XS and recent Pixel and Galaxy models are; check Settings before you buy.
• Install the eSIM at home on Wi-Fi, but leave it off. Many plans start their validity clock on first connection, not on purchase.
• On landing, switch mobile data to the eSIM line, turn data roaming on for that line (travel eSIMs technically roam on a local network) and keep data roaming off on your home line so it cannot run up charges.
• Keep your home SIM active for calls and SMS so banking and two-factor texts still arrive. Turn on Wi-Fi Calling on the home line to take calls over hotel Wi-Fi without roaming charges.
Germany is known in Europe for weak mobile coverage outside cities, and it shows most on trains:
• ICE and regional trains lose signal in cuttings, tunnels and forested stretches. The newer high-speed lines through hills, such as Frankfurt to Cologne and Würzburg to Fulda, have long tunnels. ICE trains offer onboard Wi-Fi, but it relies on the same mobile networks.
• Rural Bavaria, the Harz, the Black Forest and parts of Brandenburg and Mecklenburg still have stretches with only slow 4G or none, particularly on O2.
• The Bavarian Alps around Garmisch and Berchtesgaden drop out on trails and in valleys.
Telekom generally gives the best coverage on trains and in the countryside. On our route, the Würzburg to Ulm to Munich leg runs through exactly this kind of country; see our Würzburg day-trip guide, how many days in Munich and Munich guide for planning.
Not with an EU plan or a UK plan that includes EU roaming. US, Canadian and Australian visitors, and EE, Vodafone or Three customers, usually do better with a data eSIM, especially because German prepaid SIMs need ID verification.
Yes, but it must be verified. In a Telekom, Vodafone or O2 shop staff check your passport on the spot. Supermarket kits such as Aldi Talk need app, video or PostIdent verification afterwards, which non-EU passports do not always pass.
Telekom has the best rural and train coverage. Vodafone is second, and O2 is often cheapest but weaker in the countryside.
Many high-speed lines run through tunnels and cuttings, and rural coverage in Germany has gaps. Download Deutsche Bahn tickets to the DB Navigator app on Wi-Fi so they work offline.
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