The smart traveller's connectivity checklist: before you fly

Nothing derails the first hour of a trip like a dead phone and no signal. Maps, ride-hailing, boarding passes, and the message to say you have landed safely all depend on a connection. The good news is that arriving online takes only a little planning. This checklist walks through what to sort before you book, in the week before you fly, and on arrival, so connectivity is one less thing to think about.

Why connectivity is worth planning

Roaming on your home plan can be slow or restricted abroad, and queuing for a local SIM after a long flight is the last thing most travellers want. Sorting your data ahead of time means your phone simply works when you switch off flight mode. It also keeps you safer: a connected phone makes it easier to navigate, contact accommodation, and reach help if plans change.

If you are new to the options, our explainer on what an eSIM is is a good starting point, and our comparison of Wi-Fi versus mobile data abroad covers when to lean on each.

Before you book

• Check that your phone is unlocked and eSIM compatible. Most recent handsets support eSIMs, but it is worth confirming before you rely on one.
• Decide how you will get data abroad: an eSIM, a local SIM on arrival, or your home roaming plan.
• Note whether your destination is covered by an eSIM provider, so you know an option exists before you go.

The week before you fly

• Estimate how much data you will need. Our guide on how much mobile data for two weeks helps you choose a sensible allowance rather than guessing.
• Buy and install your eSIM in advance. You can set it up at home and schedule it to activate on arrival, so there is nothing to configure in the airport.
• Download offline maps for your destination as a backup for the moments you have no signal.
• Save key details offline: accommodation address, booking references, and an emergency contact.

The day before

• Confirm your eSIM is installed and labelled clearly in your phone settings, so you can switch to it easily.
• Charge your phone and any power bank fully. A spare battery is cheap insurance against a long travel day.
• Set your data line and check that messaging apps are signed in and ready.

At the airport and on arrival

• Keep flight mode on until you land, then switch your data line to your travel eSIM.
• Turn on your eSIM and let it connect before you leave the terminal, so navigation and ride-hailing work straight away.
• Keep your home line available for important calls or texts, with roaming data switched off to avoid surprises.

If you want a step-by-step, our walkthrough on how to install an eSIM on iPhone covers the exact taps.

Getting an eSIM sorted

For most destinations, an eSIM is the simplest way to land connected. Saily offers travel eSIMs you can install before you fly and activate when you arrive, which keeps the whole process to a few minutes at home rather than a scramble overseas.

Set up your travel eSIM with Saily

This article contains affiliate links. We may earn a commission if you purchase through them, at no extra cost to you.

Frequently asked questions

What is the easiest way to stay connected when travelling abroad?

For most travellers, installing a travel eSIM before departure is the simplest option. You set it up at home and it activates on arrival, so your phone connects to a local network without any queuing or fiddling.

Should I set up my eSIM before or after I fly?

Before. Installing and configuring your eSIM at home means there is nothing to do at the airport beyond switching it on, which is far easier than setting it up after a long flight.

How much mobile data do I need for a trip?

It depends on how heavily you use maps, streaming, and social media. Our guide on how much mobile data for two weeks gives realistic allowances for different travel styles.

Will my phone work abroad with an eSIM?

If your phone is unlocked and eSIM compatible, yes. Most recent smartphones support eSIMs, but it is worth confirming your model before you depend on one.

Can I keep my home number while using a travel eSIM?

Yes. An eSIM runs alongside your existing line, so you can keep your home number for calls and texts while using the eSIM for data. Switch off roaming on your home line to avoid unexpected charges.

What should I do if I have no signal on arrival?

Offline maps and saved booking details cover the gap. Download maps for your destination before you travel, and keep your accommodation address stored offline so you can reach it even without a connection.

Do I still need Wi-Fi if I have a travel eSIM?

Not necessarily, though Wi-Fi is handy for large downloads. Our comparison of Wi-Fi versus mobile data abroad explains when each makes sense.

How do I install an eSIM on my phone?

The process takes a few minutes. Our step-by-step guide on how to install an eSIM on iPhone walks through it, and the steps on most Android devices are similar.

What is the single most important connectivity task before a trip?

Buying and installing your eSIM in advance. With that done, you land online and every other task, from maps to messaging, simply works.