UK SIM card for international students: a first-weeks guide

A newcomer to the UK needs a UK mobile number for banks, the NHS and university admin, but a monthly contract usually needs a UK credit history, bank account and proof of address, so most people start with a pay as you go SIM and move to a contract later. Until a local SIM is in the phone, a data only eSIM keeps maps, email and WhatsApp working from the day you land.

UK SIM card for international students: what you need

You need two things: a working internet connection on arrival, and a UK mobile number for banks, the NHS and university admin. A pay as you go SIM gives the number with no contract and no credit check; a monthly contract comes later, once UK paperwork exists.

What the main options look like:

• Pay as you go SIM: no contract, no credit check. The phone must be unlocked. Buy from supermarkets and convenience stores, order online for delivery to a UK address, or pick up free SIMs in some halls welcome packs and student unions.
• Monthly contract: usually needs a credit check, a UK bank account for direct debit, proof of identity and proof of UK address.
• No credit check route: several UK SIM only brands offer plans with no credit check, and monthly rolling plans from these can be cancelled at any time. Check current terms.
• eSIM: pay as you go and rolling monthly eSIMs are offered by Three, Vodafone and several smaller brands. EE and O2 direct pay as you go eSIM availability is not confirmed, so check each operator's site.

The main networks are EE, O2 and VodafoneThree (Vodafone and Three merged on 31 May 2025; both brands are still sold). For a data only option in the first days, see the UK eSIM plan.

Prepaid SIM or monthly contract: which comes first

Prepaid first. A monthly contract is the better long term home for your number, but it usually needs a UK credit history, a UK bank account and proof of address, which take weeks or months to build. Start on pay as you go and switch when the paperwork is ready.

Why the order matters:

• A consumer guide from July 2023 lists credit checks on SIM only monthly plans at EE, O2, Three and Vodafone, but not on their pay as you go ranges.
• Most new arrivals cannot pass a UK credit check in their first months because they have no UK history, not bad history.
• A typical contract file includes proof of identity, a UK address and a UK bank account.
• Building UK credit history for a credit checked contract takes several months; no official range was found, so treat the timing as not confirmed.

A prepaid SIM keeps you reachable while all of that is in progress. Keep the SIM active with a top up if you use it lightly.

How long the paperwork takes

Expect a few days for your visa share code, up to three weeks for a UK bank account, and a proof of address letter only after enrolment and after your UK address is updated. A credit checked contract takes months of UK credit history.

Typical waits, as found in official and university guidance:

• eVisa share code: a couple of days after creating the UKVI account.
• UK bank account as an international student: up to three weeks. Needs passport, visa or share code, a university bank letter and proof of local address.
• Proof of address letter from the university: available after enrolment once the term time UK address is updated; the exact time is not confirmed, so ask your university.
• UK credit history for a credit checked contract: several months; no official range found.

Documents and eligibility rules change. Always confirm the current list with the bank, the university and the official UK government source before an appointment.

Your first 30 days in the UK: a timeline

The first days are for a UK number and a data connection; the first weeks are for the bank, the university letter and the GP. Put the SIM in early, because almost every other task asks for a UK mobile number.

A practical order:

1. Day 1 to 3: get online and get a UK pay as you go SIM. Register with a GP when you can; Oxford college guidance notes medical services are hard to use without a UK number.
2. Day 1 to 7: create your UKVI account and get the eVisa share code, which takes a couple of days.
3. Week 1 to 2: enrol and update your term time UK address, then request the university proof of address or bank letter.
4. Week 2 to 4: open the UK bank account, allowing up to three weeks. Check first whether the bank accepts an eVisa share code.
5. Month 2 onward: consider a monthly contract once you have UK credit history and a bank account, or stay on a rolling plan with no credit check.

For student specific detail, see the UK student guide.

Staying connected until your local plan is ready

A data only eSIM covers the gap between landing and having a UK SIM in hand. It gives internet for maps, email, WhatsApp and other internet calls, with no local phone number and no calls or SMS on the eSIM itself.

How it works:

• Buy online with an email address and a card, Apple Pay or Google Pay. The QR code arrives by email within minutes.
• Validity starts when the eSIM first connects at the destination, so you can buy and install it at home before the flight.
• The network is chosen automatically and cannot be picked by hand.
• More data can be added to the same eSIM later, with no new QR code.
• The phone must be unlocked and eSIM compatible. Check with the compatibility guide and the install guide.

Data options run from 1 GB to 50 GB. A 5 GB plan is $6.39, a 10 GB plan is $9.39, and a 20 GB plan is $15.99. Use the data calculator if you are unsure how much you need.

Getting a local number for your bank and admin

A UK mobile number is needed for bank security codes, NHS contact, university admin and deliveries. A prepaid local SIM gives you that number; the Slashtel eSIM does not, because it is data only with no number and no calls or SMS.

Where the number is asked for:

• Banks, for account security and appointment contact.
• GP registration and NHS services.
• University enrolment, letters and accommodation.
• Parcel deliveries and landlord contact.

One detail worth knowing: the University of St Andrews notes that UK emergency services can call back a UK number but may be unable to re-establish contact with a foreign SIM if the call drops. That is one more reason to get a UK number early.

Keep the eSIM for data while the local SIM handles calls and texts. The calls, texts and OTP guide explains how to run both.

When family visits you in the UK

Visitors can use a Slashtel eSIM for the trip. You can buy it yourself and enter the visitor's email, so the QR code goes straight to the person who will use it, and they can install it before they fly.

What to tell them:

• It is data only: no local phone number and no calls or SMS. WhatsApp and other internet calls work over the data.
• They should keep their home SIM in the phone for calls and bank codes, and turn off data roaming on it to avoid roaming charges.
• Validity starts when the eSIM first connects in the UK, so buying early is safe.
• The phone must be unlocked and eSIM compatible.

For a short visit, a 3 GB plan is $3.89 and a 5 GB plan is $6.39. If they stay longer, a 10 GB plan is $9.39. See the UK eSIM plan for the full range.

Keeping your home number active

Keep the home SIM in the phone for calls and bank codes, and turn off data roaming on it to avoid roaming charges. If the home line is prepaid, a top up keeps it active while you are away.

How to manage it:

• Leave the home SIM in the phone and use the eSIM or UK SIM for data.
• Turn off data roaming on the home line in the phone settings.
• If the home line is prepaid, top it up before it expires. Slashtel sells mobile top ups to more than 100 countries, delivered in minutes, which keep a prepaid home line active.
• Keep the home number for one time codes from your home bank and for family calls.

More on this in the keep your number active guide and the top up page.

First-week catches to avoid

The common catches are small and avoidable: no UK number when a bank or the NHS asks, a university letter requested before your UK address is updated, and a bank that does not yet accept an eVisa share code.

Checklist for week one:

• Get a UK pay as you go SIM in the first days, before the bank and GP appointments.
• Update your term time UK address with the university before requesting the proof of address or bank letter.
• Ask the bank whether it accepts an eVisa share code before you book the appointment.
• Do not sign a credit checked contract before you have a UK bank account and some UK credit history.
• Keep the home SIM active and data roaming off.

If you are still planning the move, the moving abroad hub covers the wider checklist.

Sources

Checked 2026-10-24. Rules and waiting times change, so check the official sites before you rely on them.

• University of St Andrews: https://www.st-andrews.ac.uk/orientation/before-you-depart/mobile-phones/
• University of Southampton Halls Life: https://hallslife.soton.ac.uk/story/18101562/buying-a-sim-card-as-an-international-student
• Aberystwyth University: https://aber.ac.uk/en/welcome/blogs/blog3
• Ken's Tech Tips: https://kenstechtips.com/index.php/mobile-phone-credit-check
• Ken's Tech Tips: https://kenstechtips.com/index.php/pay-as-you-go-esims
• Moving to the UK: https://movingtotheuk.co.uk/directory/sim-cards-and-mobile-phones
• University of Portsmouth: https://myport.port.ac.uk/student-services/international-student-advice/opening-a-bank-account
• UCL: https://www.ucl.ac.uk/students/international-students/international-support/money-and-finances/banks-uk/when-you-first-arrive
• York St John University: https://www.yorksj.ac.uk/international/visa-and-immigration/changes-brp-cards-to-evisas
• Lady Margaret Hall, University of Oxford: https://www.lmh.ox.ac.uk/sites/default/files/documents/2025-08/Medical%20Registration%20%28Banbury%20Road%20Medical%20Centre%29%20AWM.pdf
• University of Gloucestershire: https://www.glos.ac.uk/information/?p=13917
• Statewatch: https://www.statewatch.org/news/2020/january/uk-history-repeats-itself-with-calls-to-introduce-mandatory-sim-registration/
• TelecomTV: https://www.telecomtv.com/content/vodafone/then-there-were-three-vodafonethree-lands-in-the-uk-53120/
• Which?: https://www.which.co.uk/news/article/vodafone-three-merger-what-you-need-to-know-akikb9q10IRI