SIM cards & mobile phones for new arrivals in the UK

Your first UK SIM: what actually matters when you arrive

Most people moving to the UK think about visas, housing and bank accounts. The SIM card is an afterthought — until you land at Heathrow with no signal and realise you cannot call the letting agent, cannot receive the verification text your new bank just sent, and cannot get an Uber to save your life. A UK mobile number is not a convenience. It is infrastructure. Sort it before or on the day you arrive, not after.

The UK has four network operators that own their own infrastructure: EE, O2, Vodafone and Three. Every other provider — giffgaff, Sky Mobile, Your Co-op Mobile and dozens more — is a virtual operator (MVNO) that leases space on one of those four networks. The signal quality is identical. What differs is the price, the contract terms, and the extras layered on top. giffgaff runs on O2. Your Co-op Mobile runs on EE. When you choose between them, you are really choosing between contract flexibility and price, not between towers.

The single most important thing to know as a new arrival is this: fixed-term contracts require a UK credit check, and you will almost certainly fail one in your first months — not because you have bad credit, but because you have no UK credit history at all. The solution is simple. Start with Pay As You Go or a rolling monthly plan, both of which need no credit check and usually no UK address. Build your credit profile over six to twelve months, then switch to a contract when you qualify. That is the logical path, and it is what most settled expats would tell you.

Which network has the best coverage in the UK?

EE has the widest 4G and 5G coverage of any UK network, consistently ranking first in independent Ofcom and RootMetrics reports. O2 covers most urban areas well but can be patchier in rural Scotland and Wales. Three has strong urban 5G but lighter rural coverage. Vodafone sits broadly between EE and O2. If you are moving to London, Manchester, Birmingham or another major city, coverage differences between networks are minimal in practice. If you are moving to rural England, Scotland, the Highlands or Northern Ireland, EE — and therefore Your Co-op Mobile — is the safer choice. For most new arrivals settling in cities, any of the four networks will serve you well.

Arriving from Nigeria

Nigerian phones are frequently network-locked — tied to MTN, Airtel, Glo or 9mobile — and will not accept a UK SIM until unlocked. Request an unlock from your Nigerian operator before you travel; it is free once your contract has ended and takes a few days to process. Modern handsets sold in Nigeria support the same 4G frequency bands used in the UK (800 MHz, 1800 MHz, 2100 MHz), so compatibility is rarely a problem. The one exception is older or very budget devices, which sometimes omit the 800 MHz band that UK networks use heavily for indoor and rural coverage — worth checking if your handset is more than five or six years old. You do not need any form of UK identification to buy a Pay As You Go SIM; a passport is sufficient if ID is requested in-store.

Arriving from Italy

Italian phones from TIM, Vodafone IT and WindTre are generally easy to unlock, and many modern devices are sold unlocked outright. The more interesting question for Italians moving to the UK is not which SIM to get, but how to avoid cutting off your Italian number before you are ready. If your phone supports dual SIM or eSIM, you can run both numbers simultaneously — your Italian number stays live for family, your Italian bank's two-factor texts, and any ongoing administrative obligations, while your UK SIM handles local calls and data. Since Brexit, free EU roaming no longer applies to UK numbers; Sky Mobile and Your Co-op Mobile are the two providers in this directory that include EU data roaming on most plans, which matters if you travel back to Italy regularly.

Arriving from Romania

Romania has a well-developed and competitive mobile market, and phones purchased there are often already unlocked — particularly on Digi, which has always sold handsets SIM-free as standard. Orange RO, Vodafone RO and Telekom devices may need unlocking, but operators do this free of charge. For Romanians in the UK, the practical priority is usually staying connected with family at reasonable cost. Your Co-op Mobile includes EU roaming on most plans, which covers data and some calls when you are back in Romania. giffgaff goodybags include EU roaming too, at lower monthly outlay. For regular calls to Romanian mobile or landline numbers from the UK, WhatsApp calls over data are the cheapest option — the cost difference compared to international minutes is significant over a year.

Arriving from India or Poland

Indian phones — particularly those purchased through Jio, Airtel India or Vi — are increasingly sold unlocked, but verify before you travel. India uses some frequency bands (notably Band 40, 2300 MHz TD-LTE) that are not deployed in the UK, but all major Indian handsets also support the standard UK bands, so 4G compatibility is not a concern with any phone from the last five or six years. Polish phones from Plus, Play, T-Mobile PL or Orange PL are usually straightforward to unlock, and EU-spec devices from Poland support all UK frequencies without modification. For both communities, the same rule applies on roaming: Your Co-op Mobile and Sky Mobile are the two providers here that include EU data roaming, which covers Poland but not India.

eSIM: the fastest way to get connected

An eSIM is a digital SIM built into your phone. You activate it by scanning a QR code the provider emails you — no physical card, no waiting for delivery. The practical significance for new arrivals is that you can activate a UK number before you leave home, land at the airport already connected, and start making calls from baggage claim. Sky Mobile and Your Co-op Mobile both support eSIM. Most iPhones from the XS onwards and the majority of Android flagships from 2020 onwards are eSIM-compatible. The exception worth knowing: phones manufactured for the mainland Chinese market often have eSIM disabled at hardware level, even on models that support it elsewhere — check your phone's regional specification if you are unsure. For dual-SIM phones, eSIM is also the cleanest way to run a home-country number and a UK number side by side without carrying two physical SIMs.

Refurbished phones and buying a handset on arrival

A good unlocked smartphone does not require a new contract. Certified refurbished handsets — professionally inspected, repaired where needed, and sold with a warranty — offer far better value than new for anyone on a budget. Carphone Warehouse grades its refurbished stock clearly (A: near-perfect, B: light wear, C: visible marks) and sells in-store and online with a 12-month warranty. giffgaff sells refurbished phones on its website and lets you bundle a phone and SIM in a single checkout, which simplifies things considerably on arrival day. Mobiles.co.uk aggregates SIM-free prices across multiple retailers, useful when you know which model you want and are comparing prices. If budget is the primary constraint, secondhand markets — eBay, Facebook Marketplace, CEX — go lower still; always run an IMEI check (Checkmend is free for a basic report) before paying to confirm the device is not reported stolen or still tied to a finance agreement.

The longer-term picture is straightforward. Once you have been in the UK for six to twelve months, have a UK bank account, and are registered at a UK address, you will begin to qualify for fixed-term contracts — which typically offer lower monthly costs, phone financing, and more generous data. Mobiles.co.uk is the most efficient comparison tool at that stage. There is no reason to rush there; the rolling monthly and PAYG options available from day one are genuinely good products, not compromise positions.