Why a £1 SIM at the Tesco isn't actually the cheapest option
Britain has the lowest-friction local SIM market in Europe. Walk into any Tesco, Sainsbury's, or corner shop, hand over a fiver, and a starter SIM is yours. So far, so cheap. The catch is what comes after: registration tied to a UK address for top-ups, a 30-day expiry on the included data, and the moment you cross from England into the Republic of Ireland — a separate trip, a separate pass.
Roamzy charges $1.43 per gigabyte in the UK. That's $0.0014 per megabyte, billed in real time as your phone uses data on UK networks. No subscription. No expiry on the unused balance. No minimum bundle. One per-MB rate across 192 countries — the same logic at Heathrow, in Edinburgh, and across the Channel.
How much will Roamzy actually cost on this trip?
A typical visitor to the UK uses 0.5–1.5 GB per day: Citymapper around London, the Trainline app for intercity, Uber or Bolt around the city, the camera-translator on a museum sign, contactless payments via Apple Pay or Google Pay (the UK is essentially card-only outside markets), the occasional video call. Call it 1 GB/day for the math:
| Trip length | Roamzy ($1.43/GB) | Tourist roaming pass | Local SIM at the airport |
|---|---|---|---|
| 3 days | $4.30 | $15–40 | $10–25 + ID |
| 1 week | $10.00 | $25–60 | $15–30 + paperwork |
| 2 weeks | $20.00 | $40–100 (often two passes) | $20–35 + 30-day cap |
Competitor prices in columns 3 and 4 are 2025 ranges based on typical offerings; exact figures depend on your home carrier and the airport store you visit. Roamzy's rate in column 2 is our actual published rate from the pricing page.
A UK SIM via the supermarket is genuinely cheap if you have a UK address for top-ups. For a tourist on a 7-day trip the eSIM is the lower-friction option — pre-installed before you fly, attached the moment you're on UK ground at LHR, LGW, STN, EDI, MAN, or BHX.
Where does Roamzy work in this country?
The UK is one of the more wired markets in Europe. The shape on the ground:
- London, Manchester, Edinburgh, Glasgow, Birmingham — 5G in the centers, providers compete on quality
- Mid-size cities (Bristol, Leeds, Liverpool, Newcastle, Cardiff, Belfast) — solid LTE, 5G in central districts
- Mainline trains (London–Edinburgh, London–Manchester) — near-continuous signal end to end; brief drops in long tunnel sections
- The London Underground — newer stations and Elizabeth line wired with 4G; older deep-tube sections still drop
- The Highlands, the Lake District, rural Wales — patchy 4G and dead zones in valleys; offline maps mandatory
- Cornwall, the Peak District — workable LTE in towns, weaker on coastal paths and moors
Why is per-megabyte pricing simpler than packages?
A UK trip already brings small frictions: a card your bank flagged on the Heathrow Express, contactless that maxed at £100 last year and £200 this year, a Tube map that's not actually geographic. The data plan should not also be a problem.
Roamzy is built around that. No first-purchase promo. No fine-print throttling. No auto-renewal six months later. One rate, billed by the megabyte, balance carries. Spent 280 MB walking from St. Paul's to the Tate Modern? You paid $0.39. Today inside the British Museum offline? You paid nothing.
How do I install my Roamzy eSIM?
| Plug type | Voltage | Frequency | iOS | Android |
|---|---|---|---|---|
| Type G | 230 V | 50 Hz | iPhone XS+ | Pixel 3+, Galaxy S20+ |
- Sign in to Roamzy via Telegram or Google
- Top up the eSIM with a minimum of 20 USDT — stablecoins, no cards, no banks, no FX surcharges
- The QR code appears in the dashboard once payment confirms
- Settings → Cellular → Add eSIM → scan QR
- The counter starts the moment you land at LHR, LGW, STN, EDI, or MAN
UK plugs are Type G — bring a chunky three-pin adapter if you're coming from anywhere except Ireland or Hong Kong. Supported stablecoins, networks, and common iPhone/Android setup errors are in the FAQ.
What are Roamzy's honest limitations?
Three traps Roamzy doesn't have because they were never built in.
- No welcome promo that bait-and-switches your second top-up. The rate on top-up #1 is the rate on top-up #20.
- No fine-print throttling. One rate, full speed — first GB and the hundredth cost the same $0.0014/MB.
- No auto-renewal you forgot to cancel. Balance runs out, the eSIM stops.
It's not a marketing gimmick — it's an engineering decision born from indifference to gimmicks. You can't make a tariff cheaper than no fine-print and no expiry — so we don't.
What if my trip continues to other countries?
UK trips often extend. Same Roamzy account, same logic at the border:
- Ireland — frequent extension via Dublin, separate country rate
- France — Eurostar from St Pancras, eSIM hands over at the Channel
- If you want the underlying mechanics — how roaming actually gets priced and why it hurts