Landing in London — SIM, Water, Plugs, Apps

You’ve just touched down at Heathrow, still half-awake, and your phone’s on 4% battery. The free airport Wi-Fi connects but needs a SMS verification — which you can’t receive because your home SIM is roaming at £2 per megabyte. The next 30 minutes are where most travelers waste money, buy the wrong SIM card, and get hit with their first London buzzkill. Here’s the exact playbook for the moment you land: connectivity, water, power, transit, and the apps that actually work in this city.

Getting Online Before You Land

eSIM UK: The Best Bet for Instant Connectivity

Forget hunting down a kiosk. Activate an eSIM before your flight and you’ll be online as soon as the plane’s wheels touch tarmac. Airalo offers a UK 7-day / 3GB plan for around $5 — great for light use. If you need unlimited data, Holafly costs roughly £20 for a week, but watch out: it’s often data-only, no voice number. Saily and Nomad are solid alternatives with similar pricing and multi-country Europe bundles. All of these work on the Three, EE, or Vodafone networks. Install the app, buy the eSIM, and scan the QR code before departure. You’ll land with a working connection.

Physical SIM at Airport: When eSIM Isn’t an Option

If your phone doesn’t support eSIM, you’ll need a physical SIM. Kiosks for Three, EE, Vodafone, and O2 are present at Heathrow, Gatwick, and Stansted. Three generally has the best coverage for central London and the Tube. Expect £15–30 for a tourist SIM with 8–12GB of data and a UK number. Caveat: these kiosks often close by 9 PM or even earlier at smaller terminals. If you land late, you’ll be reliant on airport Wi-Fi until the next morning — or buy a SIM at a corner shop in central London. Check our 24-hour services guide for late-night SIM sources.

Free Wi-Fi at All Major UK Airports

Every major London airport offers free Wi-Fi. At Heathrow, connect to “Heathrow Wi-Fi” and accept the terms — no login required for the first 60 minutes. Gatwick, Stansted, Luton, and City all have similar free services. The speed is decent enough for maps, messages, and checking train times. Don’t waste time buying a SIM at the airport just for the sake of it — you can wait until you’re in town if the kiosks are closed.

Water, Power, and the First Culture Shock

Tap Water: Drink It, Save Money, Skip Plastic

London tap water is safe and good. Really. The UK has some of the strictest water quality standards in the world. Fill up your bottle at any sink. The only catch: London water is hard — high in calcium and magnesium — so if you’re from a soft-water region, your tea might taste a bit chalky. But it won’t hurt you. Avoid buying plastic bottles; tap water is free and readily available in pubs, cafes, and public fountains (look for the “Thames Water” fountains in central parks and stations). This is not Paris or Rome — you don’t need bottled water.

Power Plug: Type G, and It’s Unique

The UK uses Type G plugs: three rectangular pins in a triangle. 230V, 50Hz. If you’re arriving from the EU or the US, your standard charger won’t fit. Pack an adapter before you leave — airport electronics shops sell them for around £10–15, which is a rip-off. Buy online for £3 or get a universal travel adapter. Some hotel rooms (especially mid-range and up) have built-in USB sockets or universal outlets, but never rely on that. A power strip with a single adapter socket can charge all your devices at once.

Getting Around: Don’t Rent a Car, and Look Right

You drive on the left in the UK. If you’re from a right-hand-drive country, do not rent a car for London. The Tube, buses, and trains are faster, cheaper, and far less stressful. The one exception is if you’re immediately leaving for the countryside. For central London, car rental is a mistake. More importantly: when crossing a road, look right first, then left. The painted “LOOK RIGHT” reminders on the pavement at tourist crossings are not a joke — tourists get hit every year because they forget.

Apps You Must Download

Your phone is your London survival tool. Here’s what to install before or right after landing:

Citymapper — better than Google Maps for London transit. It shows live Tube disruptions, which exit carriage to use, and the real walking time between connections. Free.
Uber / Bolt / FreeNow — for taxis. Uber works, but black cabs can be hailed on the street or booked via FreeNow. Bolt is often cheaper. All three accept card and Apple Pay.
TfL Go — the official Transport for London app. Live Tube, bus, and tram times plus account top-up for contactless cards.
National Rail — for regional trains out of London (Brighton, Cambridge, Oxford, etc.). Real-time platform info and delay notifications.
Google Translate — rarely needed in central London, but useful with offscreen Welsh signage (unlikely) or if you get stuck with a non-English speaker. UK English spelling: you’ll see “colour”, “centre”, “travelling” — get over it.
WhatsApp — standard messaging app in the UK. Almost everyone uses it. Your home SMS plan may not work well; WhatsApp messages and calls do.
Tesco / Sainsbury’s / M&S apps — optional but handy for loyalty cards if you’re shopping at their food halls or convenience stores. Not required.

Currency, Time, and Visas

Currency: GBP and How to Handle It

Currency is GBP (£). Cards are accepted almost everywhere — contactless is king. Bring £30–100 in cash for small shops, market stalls, the occasional cab, and tips. Airport ATMs often charge fees (some up to £5). Use the free ATMs inside bank branches once you’re in central London. Avoid the Euronet/blue ATMs at airports and train stations — they rip you off with poor exchange rates. For more details, read our London money guide.

Time Zone

GMT in winter (UTC+0), BST in summer (UTC+1, clocks forward March–October). The UK changes at the same time as most EU countries, so that’s one less thing to mess up.

Visa and Entry

Most Western passport holders (US, Canada, Australia, NZ, EU, many others) get 6 months visa-free. The UK is rolling out an Electronic Travel Authorisation (ETA) system — check if your nationality requires it before booking. As of mid-2025, it’s mandatory for some non-EU travellers. Apply online in advance; it costs about £10 and takes a few days.

Airport to Central London: Exact Numbers

You’re not going to take a sightseeing bus. Here are the cold, hard logistics for each major airport:

Heathrow (LHR)

Heathrow Express — 15 minutes to Paddington station. £25 one-way if bought in advance online, £30 at the station. Door-to-door convenience at a price.
Elizabeth Line — 40 minutes to Tottenham Court Road (zone 1). £11 with contactless or Oyster. Slower but cheaper and runs directly to central stations.
Piccadilly Tube — 1 hour to central London. £6.30 off-peak. The budget option, but hot and slow in summer. Works 24/7 on weekends, but no night service weekdays.
Uber/Black Cab — £50–80 for Uber, £60–90 for a black cab. Faster if traffic is light, but can get stuck in congestion. Not worth it unless you’re three people with heavy bags.

Gatwick (LGW)

Gatwick Express — 30 minutes to Victoria station. £20 one-way. Frequent but pricey.
Thameslink — 30–50 minutes to St Pancras International. £11 with contactless. Direct to King’s Cross/St Pancras — great if you’re staying north.

Stansted (STN)

Stansted Express — 45 minutes to Liverpool Street. £22 one-way. Reliable.
National Express Coach — 1 hour 45 minutes to Victoria Coach Station. £8 if booked in advance online. Slower but cheapest option.

Luton (LTN)

Luton Airport Express — 30 minutes to St Pancras via shuttle bus + train. £14 with contactless.
National Express Coach — 1 hour 30 minutes to Victoria. £8 advanced. Again, the poor-person’s choice, but fine.

Final Operational Cheat Sheet

Best eSIM for UK: Airalo UK 7d/3GB ~$5. Activate before you fly.
Best physical SIM at airport: Three kiosk (best coverage). Expect ~£20 for 12GB.
Tap water: Yes, it’s safe. Drink it.
Plug: Type G. Bring an adapter.
Must-have app: Citymapper. Download it now.
Airport to city: Elizabeth Line from Heathrow (£11), Thameslink from Gatwick (£11), Stansted Express (£22) or coach (£8), Luton Express (£14).
Cash vs card: Card everywhere, but have £30–50 in notes for backup. Avoid airport ATMs.
Left-hand driving: Don’t rent a car for London. Look right when crossing.

For more details on cash and scams, hit our money page. For late-night pharmacy runs or emergency SIMs after hours, see the 24/7 services guide. For the broader London operational lowdown, start at /london/.