Pay by phone casino guide: how Boku, Payforit, and mobile billing actually work

Everything about depositing at a UK casino via your phone bill - the providers, the regulatory spending caps built in by design, and the one critical limitation every guide should lead with: this is a deposit-only method

Pay by phone is one of the most distinctive payment methods available at UK online casinos - letting you fund your account using your mobile phone bill or prepaid balance, with no card details or bank information ever entering the equation. This guide covers exactly how it works, the specific providers behind it, the regulatory spending limits built into the system by design, and the single most important limitation to understand before you rely on it.

The critical limitation to understand first

Critical: pay by phone is deposit-only. You cannot withdraw winnings back to your phone bill under any circumstances. Have a separate withdrawal method ready before you start playing.

This deserves to open the guide rather than being buried further down: pay by phone is a deposit-only method. You cannot withdraw winnings back to your phone bill under any circumstances - every source covering this payment method confirms this consistently. If you're planning to use pay by phone to fund your account, you need a separate, already-set-up withdrawal method ready before you start playing - a debit card, bank transfer, or e-wallet. This isn't a flaw in any specific casino's implementation; it's a structural characteristic of how mobile carrier billing works everywhere it's offered.

How it actually works

Pay by phone deposits are processed through mobile carrier billing - the amount you deposit is either added directly to your next monthly phone bill (for contract customers) or deducted immediately from your prepaid balance (for pay-as-you-go customers). No card details or bank information are shared with the casino at any point - only your mobile number.

The typical process: select "Pay by Phone" (or the specific provider name - Boku, Payforit, or Fonix, depending on what the casino offers) at the cashier, enter your UK mobile number and your intended deposit amount, then confirm via SMS - either replying to a text message or entering a one-time PIN displayed on a secure payment portal. Funds appear in your casino balance immediately once confirmed. This SMS or PIN confirmation step exists specifically to prevent unauthorised transactions, adding a security layer some card-based deposits don't require.

The four main providers, explained separately

Availability is shrinking. Boku specifically has been declining at UK casinos since 2023. At least one industry tracker has stopped recommending Boku casinos due to limited remaining availability. Verify directly before assuming any specific casino still offers it.

Boku operates as an independent payment aggregator, available in over 90 countries with a reported 28 million-plus active users globally. It partners with the UK's major networks - EE, Vodafone, Three, and O2 - and requires no account creation or app download; you simply enter your mobile number at the casino's cashier.

Payforit functions as an industry-standard carrier billing protocol supported across all major UK mobile networks, letting you add funds directly to your next phone bill or deduct from your prepaid balance.

Fonix operates under broadly the same model as Boku and Payforit, offering carrier billing with a stated daily spend limit set by UK regulation, covered in detail below.

Siru Mobile is a smaller, less widely available provider - specifically confirmed at operators including Videoslots and Mr Vegas - working on the same enter-and-confirm-via-SMS model as the others.

Which one you'll actually use depends entirely on which specific provider your chosen casino has integrated - this isn't something you choose independently of the operator; each casino selects and offers a specific provider or small set of providers, and you use whichever is available at your chosen site. UK operators known to support phone bill deposits include MrQ, reviewed elsewhere on this site, alongside Vegas Mobile Casino - both fully UKGC-licensed.

Deposit limits: a regulatory design choice, not an arbitrary restriction

Built-in spending protection. The GBP 30-40 daily cap isn't set by casinos - it's mandated by the Phone-paid Services Authority (PSA), the UK's regulator for phone-paid services. Every operator is bound by the same limit regardless of brand.

This is worth understanding in real depth, since it directly connects to this site's broader responsible gambling coverage.

The typical limits: minimum deposits commonly start around £10, with daily caps ranging from £30 to £40 depending on the specific provider (Boku specifically enforces a £30 daily cap; Payforit and Fonix are more commonly cited around £40), and a consistently confirmed £240 monthly cap across every provider and source reviewed for this guide.

These limits are set by the Phone-paid Services Authority (PSA) - the UK's dedicated, independent regulator specifically for phone-paid services - not by individual casinos. This is a genuinely important distinction: every operator offering pay by phone, regardless of size or brand, is bound by the same PSA-mandated spending thresholds. A casino cannot offer you a higher pay-by-phone limit as a promotional gesture, because the cap sits above the casino's own control entirely.

Why this matters from a responsible gambling perspective. Independent analysis specifically frames these regulatory limits as aligning naturally with the safer gambling principles this site covers throughout its responsible gambling content - a genuinely built-in, structural spending ceiling that exists regardless of your own self-control in the moment. If you're specifically looking for a payment method with an inherent, externally-enforced spending cap, pay by phone offers exactly that by design, in a way that unlimited card or bank transfer deposits don't.

Network coverage

Pay by phone is supported across every major UK mobile network - EE, O2, Vodafone, Three, and Virgin Mobile. A number of smaller mobile virtual network operators (MVNOs) - including giffgaff, Tesco Mobile, and Sky Mobile - piggyback on a major network's underlying infrastructure (giffgaff and Sky Mobile both run on O2's network, for example), meaning customers on these smaller providers get the identical mobile billing functionality as a direct customer of the parent network.

Contract versus pay-as-you-go customers experience this slightly differently. Contract customers see the deposit added to their next monthly bill, subject to whatever spend cap their specific account carries (commonly around £40 by default, adjustable through the network's own account settings). Pay-as-you-go customers need sufficient existing credit on their account for the deposit to process, since the charge deducts directly from that prepaid balance rather than adding to a future bill.

A trend worth knowing before you rely on this method: genuine decline since 2023

This is worth stating honestly rather than presenting pay by phone as a permanently stable, universally available option. Availability of Boku specifically at UKGC-licensed casinos has been shrinking steadily since 2023. A couple of years ago, Boku was among the most popular ways to fund a UK casino account by phone bill; today, a meaningfully smaller number of operators still offer it, and at least one detailed independent payments tracker has specifically stopped recommending Boku casinos on the basis that availability is now too limited to reliably build a recommendation around, expecting the remaining sites to phase it out further.

One detailed source specifically attributes this decline to the UKGC's credit card gambling ban, introduced in April 2020 - a regulatory shift that reshaped which payment methods UK operators consider low-risk enough to continue supporting. This guide presents that as one detailed source's specific causal explanation rather than an independently verified regulatory fact, but the underlying trend - genuine, measurable decline in Boku availability specifically - is corroborated across multiple sources.

What hasn't declined: phone bill deposits generally haven't disappeared - Payforit and Fonix remain more consistently available than Boku specifically, and the broader mobile-first deposit category has, if anything, grown, just increasingly through Apple Pay and Google Pay rather than traditional carrier billing. If you're specifically looking for Boku by name, verify its current availability directly with your chosen operator rather than assuming it's still offered simply because a guide (including this one) mentions it as a standard option.

Apple Pay and Google Pay: the method that's genuinely replacing phone billing

This deserves real comparison treatment, since Apple Pay and Google Pay solve pay by phone's single biggest limitation directly.

The critical difference: Apple Pay and Google Pay support both deposits and withdrawals. Unlike Boku, Payforit, and Fonix - all deposit-only, as covered at the start of this guide - Apple Pay and Google Pay let you both fund your account and receive winnings back through the same method, removing the need to separately arrange a different withdrawal route entirely.

Limits are also dramatically higher. Because Apple Pay and Google Pay process transactions through your underlying linked debit card rather than through carrier billing, they inherit that card's own limits - commonly £500 to £5,000 per day, a considerable step up from phone billing's £30-£40 daily cap. If you're specifically looking to deposit more than pay by phone's regulatory ceiling allows in a single day, Apple Pay or Google Pay is the natural next option to check.

Security works differently too. Both use biometric authentication (fingerprint or face recognition) directly on your device rather than SMS or PIN confirmation, and neither shares your actual card number with the casino - a modern security model genuinely comparable in convenience to phone billing's no-card-details approach, while adding meaningfully higher functionality.

The honest trade-off. Phone billing's £30 daily cap is, as covered earlier in this guide, a genuine built-in budgeting safeguard some players specifically value - Apple Pay and Google Pay's much higher limits remove that structural ceiling, placing more of the responsibility for spending discipline back on you directly rather than on an external, regulator-mandated cap.

A practical checklist before you use any phone-based deposit method

Confirm the operator's UKGC licence directly, consistent with this site's approach across every payment method and every operator covered - a legitimate UK-facing casino should display this clearly, and this site only covers UKGC-licensed operators for exactly this reason.

Have your withdrawal method already set up, given the deposit-only limitation covered throughout this guide for Boku, Payforit, and Fonix specifically - don't wait until you've won something to discover you need a separate payment method configured first.

Secure your own device. Because a lost or compromised phone could let someone else authorise charges to your account, using a passcode and enabling any available two-factor authentication on your device is a genuinely sensible practical precaution specifically relevant to this payment method.

Monitor your phone bill and bank statements regularly. If you spot a charge you didn't authorise, contact both your mobile network and the casino immediately to dispute it - the sooner an unauthorised charge is flagged, the more straightforward it typically is to resolve.

Fees: usually none, but worth checking directly

Most UK casinos offering pay by phone don't charge an additional fee on top of your deposit - the mobile networks themselves don't add a fee either. However, independent analysis notes that a minority of operators do apply a fee, reported as high as roughly 15%, specifically to cover the carrier billing costs they themselves are charged by the payment provider. This isn't universal, but it's a real, documented practice at some operators - worth checking a specific casino's payment terms directly before assuming every pay-by-phone deposit is entirely fee-free.

A brief history worth knowing

Mobile carrier billing as a payment method genuinely predates both Google Pay and Apple Pay by at least a decade - the underlying technology dates to the early 2000s. It didn't become a meaningful presence specifically within UK online casinos until the early 2010s, growing alongside the broader rise of mobile gaming and smartphone-first casino play. This makes pay by phone one of the more historically established mobile payment methods in the UK gambling market, rather than a recent innovation.

Who pay by phone genuinely suits

Good fit: players who want to deposit small amounts quickly without entering card details or setting up an e-wallet account, and who are comfortable with - or specifically want - a hard, externally-enforced spending ceiling built into the payment method itself, consistent with the responsible gambling principles covered throughout this site's guides.

Not a good fit on its own: players who want to deposit larger amounts in a single transaction (the £30-£40 daily cap makes this method genuinely impractical for significant stakes - Apple Pay or Google Pay, covered above, are the better choice there), or anyone who hasn't set up a separate withdrawal method in advance, given the deposit-only limitation covered at the start of this guide.

Frequently asked questions

Why is Boku becoming harder to find at UK casinos?

Availability has been shrinking since 2023, with fewer operators continuing to support it - at least one detailed industry tracker has stopped recommending Boku casinos specifically because remaining availability is now too limited to rely on. One source attributes this to the UKGC's April 2020 credit card gambling ban reshaping which payment methods operators consider viable to continue offering.

Should I use Apple Pay/Google Pay or pay by phone bill?

It depends on what you value more. Phone billing offers a genuine, regulator-mandated spending cap (£30-£40 daily) that some players specifically want as a budgeting safeguard, but it's deposit-only. Apple Pay and Google Pay support both deposits and withdrawals, with much higher limits (typically £500-£5,000 daily, inherited from your linked debit card) - better for larger amounts and simpler cashing out, but without the same built-in low spending ceiling.

Can I withdraw my winnings back to my phone bill?

No - pay by phone is a deposit-only method at every UK casino offering it. You'll need a separate withdrawal method (debit card, bank transfer, or e-wallet) set up before you start playing.

What's the difference between Boku and Payforit?

Both are carrier billing systems working on broadly the same principle, but they're operated by different companies with slightly different specific limits - Boku commonly caps daily deposits at £30, while Payforit and Fonix are more commonly cited around £40. Which one you use depends on which provider your specific casino has integrated, not on your own choice independent of the operator. Availability also differs - Payforit and Fonix have remained more consistently available at UK casinos than Boku specifically, which has been in genuine decline since 2023.

Who sets the deposit limits for pay by phone casinos?

The Phone-paid Services Authority (PSA), the UK's dedicated regulator for phone-paid services - not individual casinos. This means the same regulatory spending caps apply consistently across every operator offering the method, regardless of brand or size.

Does pay by phone cost extra to use?

Usually not - most UK casinos and mobile networks don't charge an additional fee. However, a minority of operators do apply a fee, reported as high as around 15%, specifically to cover carrier billing costs. Check a specific casino's payment terms directly before assuming it's fee-free.

Can I use pay by phone if I'm on a pay-as-you-go plan?

Yes - the deposit simply deducts directly from your existing prepaid balance rather than being added to a future bill, provided you have sufficient credit available at the time of the transaction.

This guide is for informational purposes. Payment method availability, limits, and fees vary by operator - always verify current terms directly with your chosen casino. 18+ only. UKGC-licensed operators only. Gambling problem? BeGambleAware.org | 0808 8020 133. Information correct as of September 2026.

Related reading

• GAMSTOP and self-exclusion explained
• Wagering requirements explained
• Responsible gambling
• Best online casinos UK