Cheapest SIM Only Deals UK: Lebara £1.38 vs Tesco

If you’ve been overpaying for minutes you barely use, switching to SIM-only is one of the quickest ways to cut your mobile bill. The UK market has some surprisingly cheap deals — especially if you’re willing to look beyond the big four networks. MoneySavingExpert’s current top pick offers 15GB for just £1.38/month, and a Tesco Mobile plan gives you 60GB for £15 — deals worth knowing before your next contract renewal.

Lebara top pick: £1.38/month first 9 months, then £7.90 (15GB) · Tesco 60GB deal: £15/month (24 months) · Vodafone Unlimited: £37.50/month · Major networks: EE, O2, Vodafone, Three

Which SIM Only Plan is the Cheapest?

MoneySavingExpert’s current top pick leads by a significant margin: the Lebara 15GB SIM costs just £1.38/month for the first nine months, then rises to £7.90/month — with an equivalent 12-month cost of £3.01/month (MoneySavingExpert (Consumer finance comparison site)). For light users, Lebara’s cheapest 1GB plan sits at £2.85/month with unlimited minutes and texts on a 1-month rolling contract (MoneySavingExpert Lebara page).

Lebara Deals

Lebara dominates the budget tier because it piggybacks Vodafone’s network — which has the best city coverage in the UK — while charging far less than going direct (Uswitch (Mobile comparison platform)). The 5GB plan starts at £1.10/month for the first six months, then £4.90/month, working out to roughly £3/month over a year (MoneySavingExpert Lebara page). All Lebara plans include unlimited minutes and texts, plus Wi-Fi and 4G calling support.

Tesco Mobile Options

Tesco Mobile undercuts Lebara on data volume but locks you into 24-month contracts. The 60GB plan at £15/month offers more data for heavy users, while the 30GB option costs £12.50/month and the 12GB entry-level plan sits at £10/month (Save the Student (Student finance guide)). Tesco runs on O2’s network and throws in Clubcard perks not available on budget-focused deals.

Other Network Lows

Uswitch and MoneySuperMarket list EE, O2, Vodafone, and Three alongside smaller MVNOs. No direct Vodafone SIM-only deal beats Lebara’s introductory pricing, and the major networks rarely advertise plans under £10/month without a phone subsidy (MoneySavingExpert (Consumer finance comparison site)). The pattern holds across data tiers — MVNOs that piggyback major networks consistently offer lower entry prices.

What is the Cheapest SIM Only Deal at Tesco?

Tesco Mobile’s cheapest entry point is £10/month for 12GB on a 24-month contract, with unlimited minutes and texts included (Save the Student). Unlike Lebara’s flexible 1-month rolling options, Tesco locks you in for two years — which appeals to users who prefer knowing their exact monthly outgoings without the temptation to switch.

60GB Plan

The 60GB Tesco Mobile plan costs £15/month across 24 months, totaling £360 over the contract term. This works out to roughly £15/month for 60GB — competitive if you need that volume, but more expensive than Lebara’s equivalent data allowances on a month-to-month basis (Save the Student). The plan runs on O2’s network infrastructure.

30GB Plan

At £12.50/month for 30GB, the middle-tier Tesco option sits between the 12GB and 60GB plans in both price and data allowance. For users who stream regularly but don’t need the highest caps, this represents a reasonable middle ground — though the 24-month commitment remains the same across all Tesco tiers (Save the Student).

12GB Plan

At £10/month, the 12GB Tesco plan is the most affordable option in the carrier’s lineup. It undercuts Lebara’s ongoing rates (£7.90/month after the introductory period on 15GB) but still costs more than Lebara’s introductory prices. The catch is the fixed 24-month term: if your usage changes or you find a better deal, you’re paying an early exit fee.

Is Vodafone or O2 Better in the UK?

Vodafone and O2 both operate nationwide 4G and 5G networks, but they serve different market positions. Vodafone hosts MVNOs like Lebara, Talkmobile, and Voxi, while O2 powers Tesco Mobile and giffgaff. Coverage quality varies by region — Vodafone generally scores better in cities, while O2 has strong suburban and rural presence (Uswitch).

Network Coverage

Uswitch rates both networks highly, with Vodafone showing “best city coverage” among MVNO host networks (Uswitch). O2’s network covers over 99% of the UK population for 4G, though exact speeds depend on location and device compatibility. Both support 5G in major urban areas.

Pricing Comparison

Direct Vodafone SIM-only deals start higher than MVNO alternatives — the Vodafone Unlimited plan sits at £37.50/month (Save the Student), whereas Lebara’s introductory price for comparable data undercuts it by over 90%. O2’s direct SIM plans are similarly priced above budget alternatives.

Deal Examples

MoneySuperMarket and Uswitch comparison tools surface O2 and Vodafone deals, but the lowest-cost options consistently come from piggyback operators. If you want Vodafone’s network without Vodafone’s direct pricing, Lebara is the route most comparison sites recommend (MoneySuperMarket (Price comparison platform)).

The implication: choosing a piggyback MVNO gives you the same coverage as a direct plan while avoiding the premium pricing that comes with going straight to the host network.

Which SIM Network is Best in the UK?

The major UK networks — EE, O2, Three, and Vodafone — each have distinct strengths. Which? rates Lebara as its low-data pick for budget buyers, citing EU roaming up to 30GB (Which? (Consumer advocacy organization)). The choice ultimately depends on your priority: price, data volume, contract flexibility, or roaming needs.

EE vs O2 vs Three vs Vodafone

EE typically leads on speed benchmarks but charges premium prices. Three offers competitive unlimited data deals. O2 powers Tesco Mobile and giffgaff with strong customer service reputation. Vodafone hosts multiple MVNOs, making it the backbone of budget SIM-only options (Uswitch).

Coverage and Speed

Ofcom reports show EE leading on 4G coverage breadth, while Vodafone and O2 compete closely in urban areas. All four majors now offer 5G in major cities, though 5G availability remains patchy outside urban centers (Uswitch). For SIM-only buyers on a budget, network quality matters less than getting a good data-to-price ratio.

Cheapest Options

The cheapest verified deal is Lebara’s 1GB plan at £2.85/month, with the 15GB option at £1.38/month for nine months representing the best value-for-money on a data-per-pound basis (MoneySavingExpert). For heavy streamers, Lebara’s Unlimited plan offers 5G data at £9.98/month for the first three months, then £24.95/month thereafter.

What this means: budget-conscious buyers should focus on MVNO pricing, not direct network branding — the same airtime infrastructure delivers much cheaper plans through piggyback operators.

Ten features span two categories: contract structure and network capabilities. Lebara’s no-credit-check policy and absence of exit fees make it the most flexible option for renters, students, or anyone who moves frequently.

What is the Best SIM Card to Buy in the UK?

MoneySavingExpert’s recommendation is clear: “At this level, our top pick is this 15GB/month Lebara Sim. It’s £1.38/month for the first nine months, then £7.90/month thereafter” (MoneySavingExpert). For buyers who want flexibility without long-term commitment, Lebara’s 1-month rolling contracts beat Tesco’s 24-month deals.

Unlimited Data Deals

Lebara’s Unlimited plan offers 5G data, free roaming in 37 countries, and a 1-month rolling contract at £9.98/month for the first three months, then £24.95/month. The price rises to £26.50/month from 1 April 2027 (MoneySavingExpert Unlimited page), making early sign-up worthwhile before that increase takes effect.

Low Data Cheap Plans

For light users, the 3GB Lebara plan costs £2.89/month equivalent over 12 months, making it one of the cheapest options for basic smartphone use (MoneySavingExpert). Save the Student notes that Lebara’s plans suit international students, as most include 100 minutes to over 50 countries outside the UK (Save the Student).

Provider Pros Cons

Lebara offers low prices and flexibility but lacks the in-store support of Tesco or the direct network experience of Vodafone. Tesco gives you Clubcard points but demands 24-month commitment. Which? recommends Lebara as its low-data pick for value-conscious buyers (Which?).

Three SIM-only deals span a wide range, with prices and data allowances varying by contract length and whether you choose a 1-month rolling plan or a 12-24 month commitment. Budget MVNOs consistently undercut direct network pricing.

The table below breaks down each provider’s intro price, ongoing rate, data allowance, contract type, and host network for easy comparison.

The pattern holds across data tiers — MVNOs undercut their host networks by 60–90% on introductory pricing, making Lebara’s offers stand out against both Tesco and direct Vodafone plans.

“At this level, our top pick is this 15GB/month Lebara Sim. It’s £1.38/month for the first nine months, then £7.90/month thereafter.”

— MoneySavingExpert (Consumer finance expert)

“Lebara is a great option for international students, as most of the plans include 100 minutes to over 50 countries outside of the UK.”

— Save the Student (Student finance guide)

For UK buyers who want the cheapest route into SIM-only, the path is straightforward: Lebara’s introductory deals beat everything else on price, Vodafone’s network delivers the coverage, and the 1-month contracts mean you can reassess whenever a better offer surfaces. The trade-off is the inevitable price rise after the promotional period ends — but if you time your renewal to coincide with new introductory offers, you can cycle through deals without ever paying the standard rate. Tesco Mobile makes sense only if you’ve exhausted Lebara options and need the Clubcard ecosystem, or if you genuinely prefer the certainty of a fixed 24-month price over chasing the next intro deal.

Related reading: Unlimited Data SIM Only Deals

Lebara edges ahead on rock-bottom pricing for 15GB, but Tesco SIM only deals on O2 deliver stronger value with 60GB allowances from £15 monthly.

Frequently asked questions