Mobile Network Guides, Tips & Comparisons

O2 vs EE in 2026: Which Network Is Right for You?

O2 and EE are two of the UK's biggest mobile networks. Both offer strong 5G coverage and competitive pricing, but they differ significantly in coverage reach, customer perks, and roaming policies. Here's what our advisors have found from helping hundreds of customers make the switch.

Coverage: EE currently leads O2 in raw 5G footprint, covering more of rural England and Northern Ireland. O2 holds its own in major UK cities and has been rapidly expanding its 5G network. For London residents, both networks provide excellent coverage.

O2 Priority: One of O2's standout advantages is Priority — a loyalty programme offering early access to concert tickets, exclusive restaurant deals, and prize draws. EE doesn't have an equivalent programme, though it does offer BT Sport and Apple TV+ bundles.

O2 SIM-Only Deals: Complete Guide for 2026

O2 SIM-only plans offer some of the most flexible options in the UK market. Whether you're after a cheap monthly rolling plan or a value-packed 12-month deal, O2 has something for every type of user.

Monthly Rolling Plans: O2's 30-day SIM plans start from around £10/month for 5GB of data and go up to unlimited data plans. These are great if you want flexibility to change or cancel at any time — ideal if you're between phones or waiting for a new model release.

12-Month Plans: Committing to a 12-month SIM deal usually reduces your monthly cost by 10-20% compared to rolling plans. A popular option for those who are happy with their current handset and want to reduce monthly outgoings significantly.

How to Switch to O2: PAC Code & Full Process Explained

Switching to O2 is straightforward but many customers are put off by uncertainty around the process. Here's our step-by-step guide to switching networks while keeping your existing mobile number.

Step 1 – Get your PAC code: Text 'PAC' to 65075 from your current mobile. Your network must give you your PAC code immediately. This code is valid for 30 days.

Step 2 – Choose your O2 plan: Visit us to get advice on the best O2 plan for your needs. Once decided, give your PAC code to O2 when getting your new SIM.

Step 3 – Activate your O2 SIM: O2 will arrange the number transfer, which usually happens within 1 working day. You'll get a text when complete.

Three Mobile in 2026: Is It Still Worth It?

Three has built a loyal following thanks to generous data allowances and its Go Roam feature, but how does it compare to O2 in 2026?

Data Plans: Three has traditionally offered the most generous data for the price, often including truly unlimited data on standard plans. This makes it attractive for heavy mobile data users and those who stream video frequently.

Go Roam: Three's Go Roam feature allows use of data, calls, and texts in 71 countries at no extra cost — excellent for frequent travellers. O2's roaming benefits are more limited, though available in more countries for some plan types.

Coverage: Three historically lagged behind O2 and EE in coverage but has improved significantly. In London and major cities, the difference is minimal. In rural areas, O2 generally still has the edge.

Tesco Mobile: A Budget-Friendly Alternative to O2?

Tesco Mobile runs on the O2 network, which means you get O2's excellent coverage at often lower price points. But what are the trade-offs?

Using O2's Network: As an O2 MVNO, Tesco Mobile customers use the same towers as O2 customers, which means strong coverage across the UK. This is a key advantage — you get O2 quality at a budget price.

Clubcard Pricing: Tesco Clubcard members can access discounted mobile plans, making Tesco Mobile one of the best value options for existing Tesco shoppers.

Limitations: Tesco Mobile doesn't include O2 Priority benefits, and may have slower data speeds during peak times compared to direct O2 customers due to network priority policies.

Lebara Mobile: Best for International Calling?

Lebara is one of the most popular mobile providers among the UK's international communities. Here's what makes it stand out and when O2 might be a better choice.

International Calls: Lebara's core strength is cheap or free calls to over 40 countries, including India, Pakistan, Bangladesh, Nigeria, and many others. For families with international connections, this can offer massive savings.

Network: Lebara runs on the Vodafone network, giving reasonable UK coverage but not quite matching O2's reach in some areas.

When to Choose O2 Instead: If you don't make regular international calls and want better UK coverage, reliability, and perks like Priority, O2 SIM-only plans are often the better value overall.

Sky Mobile vs O2: Who Offers Better Value in 2026?

Sky Mobile has carved out a unique niche with its roll-over data and Sky TV bundles. But does it beat O2 on overall value for non-Sky customers?

Roll-Over Data: Sky Mobile's signature feature is "Piggybank" — unused data rolls over from month to month (up to 100GB). For light data users, this can feel like excellent value.

Sky Watch: If you already subscribe to Sky TV or NOW, Sky Mobile can enhance your package with streaming benefits. This is a key differentiator that O2 can't match.

For O2 Users: If you don't have Sky TV and want competitive data pricing, O2 Priority perks, and reliable UK coverage, O2 remains one of the strongest all-round choices.

Vodafone vs O2: Which Is Better for Business Users?

Both Vodafone and O2 have strong business mobile offerings. We compare the key differences to help business customers make the right decision.

Vodafone Business: Vodafone is well-regarded for its business plans, offering shared data pools, international roaming tools, and device management features. It also has strong European coverage for business travellers.

O2 Business: O2 for Business offers dedicated account managers, competitive pricing on multi-line contracts, and Priority benefits that can be used as staff perks. O2's UK coverage in business districts is excellent.

Our Assessment: For UK-focused businesses, O2 often provides better value with more flexible pricing. For businesses with heavy European travel requirements, Vodafone's roaming tools may give it an edge.