PAYG vs SIM-only: which is actually cheaper in the UK?

For occasional calls and almost no mobile data, classic pay as you go (PAYG) can cost less than a monthly bundle. For regular data use, a prepaid 30-day bundle or SIM-only plan is usually better value. But the smallest per-minute price is not always the smallest bill: classic PAYG can carry minimum-spend rules, while a cheap bundle can renew at a higher price.

Quick answer: compare 1pMobile's PAYG and SIM deals if you barely use your phone, or start with 30-day and no-contract SIM deals if you need data each month. Check the actual payment model first: PAYG and SIM-only are not opposites. The fair comparison uses the same number of days and includes minimum spend, renewals and any upfront payment or included credit.

PAYG vs SIM-only: five payment models to recognise

A SIM-only deal simply provides mobile service without a handset. It can be prepaid, paid monthly or tied to a minimum term. PAYG describes how you pay; it is not necessarily the opposite of SIM-only. UK networks also use “PAYG” to market prepaid bundles that are not charged per call or megabyte.

Ofcom's guide to choosing a mobile package makes the same distinction: SIM-only means no handset is included, while PAYG describes a payment arrangement. Ask whether you pay for individual use or a fixed allowance, whether payment renews automatically and what leaving would cost.

1pMobile, for example, sells prepaid yearly bundles alongside classic PAYG and rolling 30-day Boosts. On a yearly product the payment is upfront, while its advertised data allowance renews every 30 days. That makes it a potential option for predictable use, but it cannot be treated like credit that you spend only when needed. You pay for the year even if you hardly use the SIM. The current 1pMobile deal listings cover selected bundles, while annual and pure PAYG products are separate choices on the operator's own product range.

When does PAYG stop being cheaper? Use the 90-day numbers

1pMobile provides a useful UK example because it sells both classic PAYG credit and 30-day bundles on EE's network.

As checked on 21 October 2026, its classic UK tariff lists 1p per standard UK call minute, 1p per UK text and 1p per MB of UK mobile data. At that data rate, 100MB costs £1 and 1,000MB costs £10, before any calls or texts. Its published 5GB Boost, by comparison, was £5 per 30 days on the date checked. The two products can serve the same phone but have radically different economics. Explore 1pMobile’s classic PAYG option if you need a pay-per-use SIM, or see the current DealPriceCheck 1pMobile comparison for live bundle offers. Classic PAYG has separate terms.

The important £10 minimum — and why the checkout price can differ

The headline 1p rate is not the whole annual cost. Under 1pMobile's official terms updated on 24 July 2026, customers joining from 1 August 2026 who use classic PAYG without a Boost must spend or use at least £10 every 90 days. If their eligible usage falls short, the operator deducts the difference from their credit balance. The terms also describe automatic top-up attempts and possible suspension if the payment requirements cannot be met.

Existing customers have different commitment periods under those published terms: £10 every 120 days for those who joined from 15 October 2025 to 31 July 2026, and £10 every 60 days for those who joined before 15 October 2025. Check your own joining date and account terms rather than using the new-customer rule for everyone.

This is a minimum amount of eligible service spending or credit deduction per commitment period, not an extra £10 charged on top of the calls and data you have already paid for. For a new classic-PAYG customer, £2 of eligible use during a 90-day period would mean another £8 deducted from credit to reach £10; spending £14 would not generate a further £10 deduction under that rule. Paying money into the credit balance is not the same as using it. If the account cannot meet the credit/payment requirement, the terms provide for suspension and possible disconnection, which matters for a backup or two-factor-authentication number.

Do not confuse that £10 of required credit spending with a £10 upfront cash price. At the time of review, 1pMobile's Classic PAYG order page advertised a £5 introductory SIM with £10 of starting credit. An eligible new customer could therefore initially pay £5 while receiving £10 credit against PAYG use and minimum-spend deductions. That is a joining promotion, not proof that keeping the SIM costs only £5 every 90 days. Future periods, top-ups, any offer expiry and the balance left after usage determine later payments. Check the currently advertised joining offer before you pay; a later renewal or top-up may follow different terms.

A like-for-like comparison over 90 days

These calculations use 1pMobile's published rates and 5GB Boost price checked on 21 October 2026. They compare service charges or credit deductions, not the actual cash paid at checkout by every new customer: joining promotions, included starting credit and existing account balances can make that different. They are not live DealPriceCheck tariff cards. Each Boost covers a 30-day period; assume uninterrupted service, the same usage in each period and no other charges.

At exactly 500MB per 30 days, these assumed service charges tie at £15 over 90 days. Above that, the £5 Boost wins on those assumptions; at lower usage, the £10 PAYG minimum still applies, so the comparison is not a simple straight line. This is not a universal 500MB break-even point: the rates, joining offers, calling minutes, texts and your usage pattern can all change the result. A bundle can win sooner if you make regular UK calls or texts.

Do not add the £10 minimum again to £15 or £30 of eligible use: it is a floor, not a surcharge. When comparing what leaves your bank account, also account for the starting credit, the initial offer and when each top-up is taken. The Boost side assumes three successful renewals at the quoted £5 rate; check its auto-renewal setting before ordering.

For a spare phone, ask what will it cost to keep the number active for the entire period? A low rate per minute is only part of the calculation.

Which should you pick for your actual routine?

If you already use several gigabytes a month, the useful shopping decision is generally not PAYG versus SIM-only: it is which SIM-only package covers your usage at the lowest suitable total cost. Compare 5GB SIM deals, 10GB deals or 30GB deals rather than calculating several gigabytes at a pay-per-MB rate. If you don't know your usage, try our mobile data calculator first.

A 365-day comparison: does paying for a year help?

A yearly prepaid bundle is a third option when you know you will need data throughout the year. As a dated example checked on 21 October 2026, 1pMobile listed a 1-year 5GB plan for £55 upfront, with 5GB refreshed every 30 days, while its ordinary 5GB Boost cost £5 every 30 days. Twelve Boost purchases cost £60 but cover only 360 days; to keep a 30-day Boost running uninterrupted through day 365, you would normally make a thirteenth £5 purchase, taking the illustrative total to £65. The advertised £55 year plan would then save £10 on these assumptions, in return for paying upfront and accepting the yearly product terms.

These figures are a comparison of two distinct prepaid products, not a promise that an existing rolling deal can be converted into the annual plan or that one unused 30-day allowance carries into another. If you need only three months of service, the three 30-day Boosts in the earlier example would be £15; paying £55 upfront would be wasteful. Compare 1pMobile’s annual 5GB option to see the product-specific terms and the current amount payable before ordering.

A backup SIM has a different risk: losing the number

Low usage does not mean you can leave any PAYG SIM untouched forever. Ofcom warns that providers can suspend and eventually recycle numbers after inactivity; its PAYG inactivity guidance notes that the permitted interval can differ substantially by operator.

For a spare phone, ask exactly what keeps the line active: an outgoing call, an SMS, a data session, topping up or meeting a minimum spend. Those are not interchangeable requirements. Put a reminder in your calendar, keep sufficient credit and test that the number works before relying on it. If it is used for account-recovery messages or two-factor authentication, losing the number is a more serious problem than losing a little prepaid credit.

Where to compare 1pMobile and Lyca without mixing up the products

1pMobile — for a genuine PAYG-versus-bundle decision. It sells pay-per-use credit, rolling 30-day Boosts and prepaid yearly bundles. That lets you compare a spare-phone account, a monthly data allowance and a longer prepaid option within one provider. Our 1pMobile deals page carries selected current bundle offers with their own View Deal routes; if you specifically want classic PAYG or a prepaid yearly option, browse 1pMobile's PAYG and bundle products. A rolling-bundle card must not be mistaken for a pay-per-minute PAYG product.

A practical warning if you change your mind: under 1pMobile's published terms, failure to pay a recurring Boost can move the service back to classic PAYG. Check which rules and minimum-spend period then apply to your account; do not assume stopping a bundle ends every obligation automatically.

Lyca Mobile — for a prepaid-style bundle or flexible UK data deal. Some Lyca offers use PAYG language while supplying a package of UK data, calls and texts for a defined period. Other products have longer payment commitments, so do not assume every Lyca SIM is a one-month PAYG product. Compare the actual term, how renewal works and the full cost in our Lyca Mobile SIM-only comparison. If you want to review the provider's wider entry-level range, you can also explore Lyca's cheap SIM-only offers.

Both brands use EE's underlying UK network, but the same host network does not guarantee identical features, signal experience, speeds, roaming or support. Coverage and the product terms still come before affiliate availability or a low-looking headline price.

If you prefer to compare providers rather than follow a brand recommendation, open our 30-day/no-contract comparisons, select enough data and check the Full plan details before using the existing View Deal button for the actual tariff. Those tariff-specific affiliate links remain separate from the contextual links in this guide.

Five costs and conditions people overlook

1. Minimum spend versus minimum top-up. Loading £10 of credit is not necessarily a £10 usage charge. Conversely, unused credit can be reduced by a published minimum-spend shortfall. Read both rules, including any auto-top-up setting.

2. A 30-day renewal is not a calendar month. Twelve periods cover only 360 days. A rolling bundle started on day one normally renews again on day 361 if you need uninterrupted cover through a full 365-day year. Compare the number of paid periods, not merely a price labelled “monthly”.

3. The price after an introductory offer. A prepaid bundle can change price at renewal and a pay-monthly contract can have a published price-rise mechanism. Compare the whole period you expect to stay, including any setup cost, extra data or calls.

4. Cancelling versus stopping a renewal. A prepaid auto-renewing package may continue charging your payment method until you switch it off. A rolling contract can still have notice requirements. A fixed-term SIM-only contract may have early termination charges. Confirm the process before ordering.

5. International use, roaming and unusual numbers. Unlimited UK minutes do not normally mean calls to international or premium numbers are included; travelling abroad is another set of rules. A bundle with international minutes can be better for someone calling family overseas, but only if the destination and number type are covered. Our international-calling SIM guide deals with that separate decision.

What about credit checks?

Traditional prepaid PAYG does not normally involve a credit check, as Ofcom explains. But SIM-only does not automatically mean no credit check, and neither does the phrase “30-day plan”. A rolling plan charged after use may have different checks from a prepaid bundle. If this is your priority, use our dedicated no-credit-check SIM guide and check the exact product at checkout. No credit check does not mean no identity, payment or fraud checks.

A better way to buy: compare the full period, then the exact offer

Start with your last three complete billing periods or a realistic estimate of your use. If you use almost no data, calculate PAYG spending including the cost of keeping your number active. Otherwise, shortlist a bundle just above your busiest normal month and compare adjacent sizes; more data can occasionally cost no more than less.

Next, compare the total amount payable over the time you actually intend to keep the SIM. For prepaid bundles, include every renewal and any later price. For a contract, include its minimum term, known changes and potential cost of leaving early. Check coverage, roaming, international calls and over-allowance charges only where they matter to your use.

Then take the shortest useful route to a real offer: compare current SIM-only deals, narrow them to flexible 30-day plans if commitment matters, and choose from the current Full plan details and View Deal options. A pay-per-use product without a matching catalogue card should be checked via its provider's PAYG terms rather than represented by an unrelated bundle.

Frequently asked questions

Is PAYG the same as a 30-day SIM-only plan?

No. Traditional PAYG takes credit for individual calls, texts and data. A 30-day SIM-only plan provides a predefined bundle. Some providers market prepaid 30-day bundles as PAYG, so look at how the service is charged rather than its name.

Is PAYG actually cheaper if I rarely use my phone?

It can be, but work out the minimum spending and inactivity conditions first. For a new 1pMobile Classic PAYG customer, the published requirement is £10 in eligible use or credit deductions per 90 days. A discounted starter SIM with included credit can reduce the first checkout payment, but it does not remove the ongoing spending requirement.

How much data can I use before a bundle becomes cheaper?

There is no universal threshold. In the dated example above, 500MB every 30 days means £15 in PAYG credit spending over 90 days versus three £5 Boost charges, assuming no calls or texts. That does not compare the cash paid by a new customer receiving promotional starting credit, and the minimum spend, rate, usage and other calls can change the calculation. If you use several gigabytes, start with 5GB SIM deals instead of paying per MB.

Can I have SIM-only with no credit check and no 12-month contract?

Yes, qualifying prepaid or rolling products are available. But not every 30-day product has the same eligibility checks or cancellation terms. Confirm the particular offer; see our no-credit-check comparison.

Will my PAYG credit or number expire if I don't use it?

Not necessarily on the same timetable. Credit validity, any minimum spending obligation and inactivity-based disconnection are separate conditions. Check all three. Ofcom warns that an unused PAYG number can eventually be recycled.

Can I keep my mobile number when moving from PAYG to SIM-only?

Usually yes. Text PAC to 65075 from the number you want to keep, give the code to the new provider and follow its transfer instructions. A PAC does not erase any legitimate outstanding early-exit obligations. See how to keep your number when switching and Ofcom's switching instructions.

Editorial conditions checked 21 October 2026. DealPriceCheck compares selected UK offers, not the whole market; prices, plan availability and minimum-spend rules can change. Check your exact terms before ordering. Some links may earn us a commission at no extra cost to you.