Tesco Mobile SIM Only – Compare Best Plans and Prices for 2025

Tesco Mobile has carved out a distinct position in the UK SIM-only market by blending competitive pricing with a rewards programme tied to the country’s largest supermarket chain. Its 12-month contracts, running on the O2 network, now include plans ranging from £8 for 2GB of data up to £30 for unlimited data, with unlimited calls and texts across the board. For shoppers already collecting Clubcard points, the effective value can go beyond the headline price.

The operator, a mobile virtual network operator (MVNO) that piggybacks on O2’s infrastructure, has focused its 2025/2026 offering on simplicity. Unlike some rivals that offer 30-day rolling or 24-month terms as standard, Tesco Mobile’s core SIM-only range is built around the 12-month commitment. This structure appeals to users who want price certainty without locking themselves in for two years.

Whether you are a light user looking for the cheapest possible entry point or a heavy streamer needing uncapped data, the current line-up covers a broad spectrum. The key differentiator, however, remains the Clubcard integration, which Tesco says can freeze the basic monthly usage price for the entire contract period.

What are the best Tesco Mobile SIM only deals?

Tesco Mobile’s SIM-only offers centre on 12-month contracts, with a single unlimited-data option and a pay-as-you-go alternative for those who prefer no commitment. Here is a quick overview of the main categories available.

Here are the key insights into the current Tesco Mobile SIM-only line-up, based on live pricing from Uswitch and Tesco Mobile’s own site.

• All standard SIM-only contracts include unlimited minutes and texts.
• The cheapest contract plan is 2GB for £8 per month.
• Mid-range options such as 60GB for £17.50 and 100GB for £20 offer strong value for moderate users.
• Tesco Mobile runs on the O2 network, providing 4G and 5G coverage across much of the UK.
• Clubcard points can be collected on qualifying plans, and some offers include bonus points for spending in Tesco while on contract.
• eSIM compatibility is available, according to Uswitch listings.
• International roaming is included on SIM-only deals, with EU roaming subject to fair use limits.

The table below shows the full range of 12-month contract plans.

Can I keep my number with a Tesco Mobile SIM only?

Yes, Tesco Mobile confirms that you can change your SIM card and keep your existing phone number. The process follows the standard UK switching procedure and is designed to minimise downtime.

How to port your number

To move your number to a Tesco Mobile SIM-only plan, you first need to request a PAC code from your current provider. A PAC code is a nine-character alphanumeric code that unlocks your number for transfer. Once you have it, you provide it to Tesco Mobile during the activation process. Porting typically completes within one working day.

How does Tesco Mobile PAYG SIM work?

Tesco Mobile’s pay-as-you-go SIM is free to order online, and it works without any contract or credit check. You top up credit as needed, either through the Tesco Mobile app, online via the website, or by purchasing a top-up voucher at a Tesco store. Data can be purchased as add-on bundles, or you can simply use pay-per-use rates if you prefer not to commit to a bundle.

How do I top up a Tesco Mobile SIM only plan?

For contract SIM-only plans, billing is handled by direct debit, so no manual top-up is needed. For PAYG users, top-ups can be made instantly using the Tesco Mobile app, the website, or by entering a voucher code from a store. Tesco Mobile also offers an auto top-up feature for PAYG customers, which automatically adds credit when the balance falls below a set threshold.

How does Tesco Mobile SIM only compare to other providers?

Tesco Mobile competes directly with other supermarket MVNOs such as Sky Mobile and Asda Mobile. All three run on the O2 network, so coverage quality is broadly similar. The differences lie in pricing structure, rewards, and flexibility.

Of the three, Tesco Mobile is the most rewards-led option, because it explicitly promotes Clubcard discounts, points, and frozen contract pricing. For customers who already shop regularly at Tesco, the effective cost of a SIM-only plan can be lower than the headline price when Clubcard value is factored in. Sky Mobile, by contrast, differentiates itself with a data rollover feature that allows unused data to be carried forward. Asda Mobile tends to be positioned as a straightforward value option without a loyalty reward scheme. For a more detailed look at Sky Mobile’s customer support, see the Contact Number For Sky article.

What is the process for switching to Tesco Mobile SIM only?

Switching to Tesco Mobile involves a straightforward sequence of steps, from ordering the SIM to completing the port. The following timeline outlines the typical process.

1. Order a free SIM from the Tesco Mobile website or pick one up in a Tesco store.
2. Activate the SIM online and select either a contract plan or PAYG service.
3. If you want to keep your number, request a PAC code from your current provider before starting the activation.
4. Enter the PAC code during the Tesco Mobile activation process.
5. Porting of the number typically completes within one working day.
6. Start using the new SIM. For PAYG, top up as needed; for contract, the first bill arrives after 30 days.

Tesco Mobile also offers a new-number option if you do not wish to port an existing number. In that case, you simply skip the PAC code step.

What is certain and what remains unclear about Tesco Mobile SIM only deals?

The pricing and plan details here are based on current listings on Uswitch and Tesco Mobile’s official website. Promotions change periodically, so it’s worth verifying the final price before signing up.

Why does Tesco Mobile SIM only stand out in the UK market?

Tesco Mobile’s popularity stems from its combination of O2 network reliability and the Clubcard rewards ecosystem. As an MVNO, it does not operate its own physical network but leases capacity from O2, which means customers get the same 4G and 5G coverage as O2 direct users, often at a lower price. Contract SIM-only plans from Tesco Mobile are typically cheaper than equivalent plans sold directly by O2, while offering the same underlying network quality.

The PAYG option appeals to light users who want no commitment, as the SIM is free to order and top-ups are flexible. For heavier users, the 12-month unlimited data plan at £30 per month is competitive, though not the cheapest in the broader UK market. The Clubcard points integration adds an extra layer of value for Tesco shoppers, who can redeem points against future bills or other Tesco purchases. You can also check the O2 coverage checker to confirm network reliability at your address before committing.

For those interested in how mobile services interact with broader digital banking, the Lloyds Bank New Mobile Banking Feature – All You Need to Know article provides relevant context on the evolving mobile landscape.

What do official sources say about Tesco Mobile SIM only?

Tesco Mobile’s own website describes its SIM-only deals as “our best SIM only deals,” highlighting the Clubcard Price promise that freezes the basic monthly usage price for the minimum contract period. MoneySavingExpert, a trusted UK consumer site, notes that the cheapest Tesco Mobile SIM costs £9 per month (for a 12GB plan in standard pricing), and recommends comparing the total cost of ownership including Clubcard rewards.

“Our best SIM only deals – get unlimited minutes and texts, plus data from 1GB to unlimited, with Clubcard Prices.”

Tesco Mobile official plans page

“The cheapest Tesco Mobile Sim costs £9/month. Compare deals and save with Clubcard points.”

MoneySavingExpert

“Tesco Mobile runs on the O2 network. Check coverage before you switch.”

O2 coverage checker

What should you consider before choosing a Tesco Mobile SIM only plan?

The best choice depends on your data usage, whether you already shop at Tesco, and your willingness to commit to a 12-month term. Light users may find the 2GB plan at £8 per month sufficient. Moderate users who stream music or use navigation apps might prefer the 60GB or 100GB tiers. Heavy users who rely on tethering or video streaming should evaluate the unlimited plan at £30, but should check the fair usage terms first.

If you are undecided, ordering a free PAYG SIM gives you the flexibility to test the network without any obligation. You can always convert to a contract plan later. Setting up a direct debit for contract plans or an auto top-up for PAYG ensures uninterrupted service. Keep an eye on Tesco Mobile’s promotional periods, such as Black Friday, when discounted Clubcard prices may be introduced for new customers.

Frequently asked questions