What to save offline before you lose signal
There is a particular kind of panic that only happens at 2 a.m. in a foreign airport: no signal, no wifi, and the address of your accommodation sitting in an email you can't open. I've been there. It isn't a disaster — it's just an hour of your life spent solving something that thirty seconds at home would have prevented.
The awkward truth about connection problems is circular: you need data to fix a data problem. If your eSIM won't activate, the QR code is in an email. If you're lost, the map is online. Everything you'd reach for is on the other side of the connection you don't have. So the fix isn't a better plan — it's a handful of things saved offline before you leave.
The five things to save before the plane
Your eSIM activation details. This is the one almost everyone forgets, and it's the one that matters most. Screenshot the QR code and the manual activation codes, and put the screenshot in a favourite album. If your eSIM needs reinstalling in a country with no wifi, that screenshot is the difference between five minutes and a very long evening.
An offline map of your arrival city. Google Maps lets you download a region for offline use — search the city, tap the name, then "Download". It works with no connection at all, including turn-by-turn walking directions. Do the airport and your neighbourhood at minimum.
« Everything you'd reach for in an emergency lives on the other side of the connection you don't have. »
Your first address, in the local script. Not just "Hotel Sakura, Tokyo" but the address as a taxi driver would read it. Screenshot it. A driver who can read the destination is worth more than any translation app that needs a network.
Bookings and boarding passes as files. Add passes to your phone's wallet, and screenshot the confirmation numbers for flights, hotels and transfers. Wallet passes work offline; the email they arrived in does not.
The emergency numbers. The local equivalent of 112, your embassy, and your bank's international line — the one printed on the back of your card, which you cannot read if the card is what you've lost. Put them in a note.
Where to put them so you can actually find them
Scattered screenshots in a camera roll of four thousand photos are the same as no screenshots. Make one album called "Trip" and put everything in it, or one note pinned to the top of your notes app. Ten seconds of organisation now, at the moment you're calm.
A second copy matters too: send the same things to someone at home, or to yourself in a message you can open on another device. Phones get lost, and the backup that lives only on the lost phone was never a backup.
The one thing to test, not just save
Before you leave, turn on airplane mode and try to find your hotel address, open your offline map and read your booking. Two minutes. If any of it fails, you've discovered it in your kitchen instead of a taxi rank. This test catches more problems than any checklist, because it uses the same conditions you'll actually face.
📶 Léa's tip
Install your travel eSIM at home, on wifi, before you fly — the installation needs a connection, the activation doesn't. It then switches on by itself when you land. Check your phone is compatible in 30 seconds here, and pick your destination on the destinations page.
What to remember
You can't solve a connection problem with the internet. Save your eSIM codes, an offline map, your first address, your bookings and the emergency numbers — all in one place, with a copy somewhere else. Then test it in airplane mode. It takes ten minutes and it removes the only travel problem that feeds on itself.
— Léa, who once found a hotel in Osaka by showing a screenshot to four people in a row.
