Getting an eSIM at London Heathrow Airport (LHR): Traveler's Guide

Overview

Heathrow handles roughly 80 million passengers a year across Terminals 2, 3, 4 and 5, and it offers free Wi-Fi, but SIM shops inside the terminals are limited. The quickest way to be online the moment you land is to install an eSIM before you fly. Free airport Wi-Fi is a handy backup for messaging and booking your ride into London.

Airport Wi-Fi

Available

Yes

Quality

Heathrow's free Wi-Fi is fine for messaging, maps and booking transport, but speeds drop in busy periods and it is not ideal for large downloads or video calls.

Cost

Free. Connect to the airport network and accept the terms on the sign-in page. No payment is needed.

Time limit

Heathrow has generally not capped sessions, but terms can change, so check the sign-in page. Public Wi-Fi is also less private, so avoid banking on it without a VPN.

SIM cards at the airport

Sold at the airport

Yes

Where to buy

Options inside the terminals are limited. Some terminals have a WHSmith selling prepaid SIM packs and a Vodafone outlet, but availability differs by terminal and changes over time. Check the Heathrow website or terminal maps for current locations, and do not count on one being open at your arrival time.

Typical prices

Prepaid tourist SIMs in the UK commonly cost somewhere in the range of 10 to 30 pounds depending on data allowance and validity, and airport prices are often higher than high street prices. Check the pack before you pay.

Wait times

Plan on 10 to 30 minutes or more at peak arrival times. That covers finding a shop, queueing, and then swapping the physical SIM and setting up the plan. You will also need your phone to be unlocked.

Why an eSIM

With a Fresim eSIM you tap Install on iPhone (iOS 17.4 or later) or Install on Android (Android 10 or later) in your delivery email, and the eSIM installs in moments, so you can sort it out at home before you leave. You can also scan the QR code from another screen if that is easier, or share the eSIM with a travel companion. When you land at Heathrow, you switch on the line and are online while you wait for your bags, with no queue and no tiny SIM tray to fiddle with. Your home SIM stays in your phone, so you keep your usual number for calls and bank codes.

Step by step

• Before you fly, check that your phone supports eSIM and is carrier-unlocked. Open your Fresim delivery email and tap Install on iPhone (iOS 17.4+) or Install on Android (Android 10+).
• Make sure the eSIM is installed and labelled, but keep it switched off until you land. Keep your home SIM on for calls and texts.
• When you land at Heathrow, turn off Airplane Mode, set the Fresim eSIM as your mobile data line and turn on data roaming for that line.
• If the data does not connect, restart your phone and check that the eSIM line is selected for data. Free Heathrow Wi-Fi is a backup while you troubleshoot.
• Open your maps and ride apps, then head to the Elizabeth line, Heathrow Express, the Tube or a taxi rank with directions loaded.

Pro tips

• Install the eSIM on home Wi-Fi before you leave. Do not leave setup until you reach the terminal, where signal indoors can be patchy.
• Switch your data line manually. Many phones keep using the home SIM for data unless you choose the eSIM line, which is the most common cause of surprise roaming charges.
• Load your onward route in offline maps before you leave the terminal. Signal can be weak in the Tube and on some underground platforms.
• Do not rely on a SIM shop at a particular terminal. Which shops are open varies, so treat any airport SIM as a last resort.
• If you transfer between terminals, check the free Wi-Fi sign-in again. You may be asked to reconnect and accept the terms.

If you missed it

If you did not sort out data before landing, you can use the free airport Wi-Fi to buy and install an eSIM before you leave the terminal. Failing that, mobile network shops on high streets in central London and towns near Heathrow, such as Hounslow, sell prepaid SIMs. Take your passport, and expect to spend time in the shop.