eSIM for Germany: for business trips, trade fairs and exchange semesters
A trip to Germany is rarely just a holiday: someone flies in for a trade fair in Hannover or Frankfurt, someone else starts an exchange semester, and someone simply spends a few days moving between Berlin, Munich and Cologne for work meetings. Each scenario needs a different kind of connectivity. Here is how to pick an eSIM around the actual purpose of the trip, not just around a gigabyte number.
A business trip: the exhibition hall, the hotel, the call back to the office
At large trade fairs such as Hannover Messe, IFA in Berlin or the Frankfurt Book Fair, hotel and venue Wi-Fi is often shared by thousands of attendees at once, and a call to a client or the home office can drop at the worst possible moment.
A separate data line on the phone removes that dependency: a video call, a cloud presentation or a document upload runs over the mobile network instead of the venue's shared Wi-Fi. The main SIM can stay in the phone for regular calls and work texts.
For a day packed with meetings across town, a few gigabytes a day is enough for maps, ride-hailing and messengers; for video calls and uploading presentations, choose a plan with more headroom.
The train as an office: staying connected between Berlin, Munich and Frankfurt
High-speed ICE and regional trains are the usual way to move between German cities, and many travellers bring a laptop to work along the way. Coverage on trains is not perfectly even everywhere: on some stretches, especially in tunnels and the hillier terrain of southern Germany, signal can briefly drop.
That is not a reason to skip working on the train, but it helps to download the documents and an offline route map in advance, so a short gap in coverage does not derail a deadline.
- The Frankfurt–Stuttgart–Munich route crosses hilly terrain with a few weaker-signal stretches
- In longer tunnels, connection can drop for a minute or two
- Save the ticket and hotel booking in the app beforehand rather than opening it mid-journey
- For a conference call on the train, a seat near a window helps where the carriage has a signal booster
An exchange semester or internship: internet for several months
For those going to Germany for a semester or an internship lasting several months, a one-week plan makes little sense — a longer plan or a local plan that can be topped up once the data runs out is a better fit, without changing the phone number or buying a new physical SIM.
The home number can stay in the phone as a second line, for calls to family or banking texts, while the German data line handles studying, messengers and streaming.
Berlin and Munich — a different pace of city
Berlin is spread out, and a single day often moves across several districts, so navigation and scooter or car-sharing apps tend to run almost continuously throughout the day.
Munich is more compact, but during Oktoberfest or major trade fairs, mobile networks in the centre get noticeably busier simply from the sheer number of people gathered there — worth keeping in mind if an important call falls during that time.
A checklist before flying to Germany
A few steps worth doing before departure so no time is lost at the airport or hotel.
- Install the eSIM ahead of time via QR code or Quick install, rather than waiting to land
- Check in phone settings that data roaming is switched on specifically for the eSIM line
- Download an offline city map and the ICE route in case of a coverage gap along the way
- Check the plan page for hotspot support if a laptop needs to be connected too
- For a trip of several months, check in advance whether the plan can be topped up or extended