UK SIM Card Company Guides
Money-Saving Tips for Free SIM Deals

Practical guides to the SIM card companies behind today's best deals — GiffGaff, Lebara, switching networks, eSIMs, activation and saving on your mobile plan.

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Quick answer: Which SIM card companies should I compare in the UK?

The UK SIM card companies worth comparing on value are GiffGaff (O2 network, goodybags from about £6/month) and Lebara (Vodafone network, plans from about £5/month) — both are no-contract with 5G included. The guides below cover their deals, switching networks, eSIMs, PAC codes and keeping your number.

Last updated: 16 October 2026. Prices verified against giffgaff.com and lebara.co.uk.

Latest Free SIM Card Guides

Every guide covers the two SIM card companies UK switchers pick most — GiffGaff and Lebara — plus free SIM deals, eSIMs, activation and switching, then use the homepage to order the SIM that fits your budget.

SIM Only Deals From £5/month No Contract

Cheap SIM Only Deals UK: How to Pay Less Every Month

How to find a genuinely cheap SIM only deal in 2026: what price per GB to expect, how much data you actually need, and how to switch networks in minutes without losing your number.

Rolling 30-Day

No contract, cancel anytime

No Credit Check

Instant approval

Keep Your Number

Switch with a PAC code

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Lebara SIM Card Free SIM UK No Contract

Unlock Your Savings: Get a Free Lebara SIM Card in the UK

Unlock big savings with a free Lebara SIM card in the UK. Learn how Lebara SIM only deals, Vodafone coverage, international calling, flexible bundles and no-contract mobile plans can help you stay connected without overspending.

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Business SIMs From £5 per User

Cheapest Business SIM Only Deals UK: Equip Your Team for Less

Compare the cheapest business SIM only deals for UK companies, with per-user budget guidance and a step-by-step team deployment plan — no contracts, no credit checks.

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Switching Guide PAC Code

How to Get a PAC Code and Keep Your Number

The complete PAC code guide: text PAC to 65075, order a free SIM, and transfer your number in 1-2 working days — plus common problems and fixes.

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Giffgaff Help & Support

Giffgaff Customer Service: How to Contact Giffgaff

Giffgaff has no phone number — here's how their online-only support actually works and the fastest way to get a problem fixed.

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eSIM Guide Instant Setup

What Is an eSIM? How It Works & Who Needs One

The plastic SIM is going digital. What an eSIM is, which phones support it, and how to get a free Giffgaff or Lebara eSIM today.

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Giffgaff 5-Minute Setup

How to Activate a Giffgaff SIM Card

Register and activate your Giffgaff SIM in under 5 minutes — plus how to claim the £5 bonus credit and keep your old number.

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Switching Guides by Network

Leaving a big network? One guide per network covers the PAC code, exit fees, coverage checks and customer service routes — plus the cheapest like-for-like replacement.

Switching Guide O2

Leaving O2: PAC Code, Exit Fees & What to Switch To

Text PAC to 65075 or call 202 — every way out of O2, what early termination really costs, how to check coverage, and the cheapest route onto the same network.

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Switching Guide Vodafone

Leaving Vodafone: PAC Code, Exit Fees & Alternatives

Text PAC to 65075 or call 191 — Vodafone exit fees explained, coverage checks, every contact route, and the cheapest way onto the same network.

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Switching Guide EE

Leaving EE: PAC Code, Exit Fees & Cheaper Alternatives

Text PAC to 65075 or call 150 — EE exit fees, coverage checks, UK call-centre details, and cheaper routes to strong signal.

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Switching Guide Three

Leaving Three: PAC Code, Exit Fees & Alternatives

Text PAC to 65075 or call 333 — Three exit fees, coverage checks (including the VodafoneThree merger), and cheaper alternatives.

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PAC Code Giffgaff

Giffgaff PAC Code: Keep Your Number When Switching

Text PAC to 65075 or request it in your online account — giffgaff has no phone line, here’s every working route.

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PAC Code Lebara

Lebara PAC Code: Keep Your Number When Switching

Text PAC to 65075, use MyLebara or call 5588 — get your Lebara PAC code free in under a minute.

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Data Guide 500MB-50GB

How Much Data Do I Need? UK SIM Data Guide

What 500MB, 6GB, 20GB and 50GB actually get you — and the cheapest SIM plan for every usage level.

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Network Help O2 Network

Giffgaff Coverage & Customer Service

Giffgaff runs on O2 — how to check signal at your postcode and how its online-only support actually works.

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Network Help Vodafone Network

Lebara Coverage & Customer Service

Lebara runs on Vodafone — how to check signal at your postcode and reach support (call 5588 or live chat).

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Need a Free SIM Card Now?

Use our homepage to compare free GiffGaff and Lebara SIM cards, check the benefits, and choose a no-contract mobile plan that could cut your phone bill.

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UK SIM Card Company Guides Money-Saving Tips for Free SIM Deals

Quick answer: Which SIM card companies should I compare in the UK?

Latest Free SIM Card Guides

Switching Guides by Network

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UK SIM Card Company Guides
Money-Saving Tips for Free SIM Deals