Last updated: 28 August 2026
Boku deposits at UK online casinos are typically capped at £30 per transaction, with daily limits usually falling between £30 and £40 depending on your mobile network and the specific operator. As a pay-by-mobile method, Boku charges deposits either to your monthly phone bill if you’re on contract, or deducts from available prepaid credit if you’re pay-as-you-go — critically, it never involves borrowing against a credit card. This guide explains exactly how the limits work and why they exist.
Key points
- £30 per transaction is the common UK cap, though some operators set lower single-deposit limits.
- Daily limits typically run £30 to £40, varying by network and operator, with some monthly caps around £240.
- Charges go to your phone bill or prepaid balance, never to borrowed credit card funds.
- Network-level caps apply on top of casino rules, meaning your mobile provider also constrains what’s possible.
- Boku is built for small, fast deposits, not for funding a large bankroll in one go.
How Boku actually works as a deposit method
Charging your phone bill or prepaid balance
Boku is a pay-by-mobile deposit method: when you deposit at a casino using Boku, the charge is applied either to your monthly mobile phone bill if you’re on a contract plan, or deducted directly from your available pay-as-you-go credit if your network supports this functionality. There’s no separate Boku account or card involved — the transaction runs entirely through your existing mobile billing relationship.
This structure is precisely what makes Boku appealing to a specific segment of players: it requires no bank card details to be entered at the casino at all, and the deposit confirmation happens directly through your phone, typically via a text message or an in-browser confirmation tied to your mobile number.
Why it can’t be used with borrowed credit
A defining characteristic of Boku deposits in the UK gambling context is that they’re structurally tied to your phone bill or genuinely available prepaid balance, not to borrowed funds. This aligns with the broader UK regulatory principle that gambling deposits generally cannot be funded via credit card, since credit represents borrowed money rather than funds you already have.
Because a pay-as-you-go deduction only works against credit you’ve actually topped up, and a contract bill charge is settled from your own account at the end of the billing cycle rather than functioning as revolving credit, Boku deposits fit naturally within this broader restriction without requiring a separate carve-out.
The deposit limits explained
The £30 per-transaction cap
The most commonly cited limit for UK Boku casino deposits is £30 per single transaction. Some operators set their own lower single-deposit caps as an additional layer on top of this, but £30 is the figure most frequently referenced as the practical upper limit for what you can deposit in one go using this method.
Daily and monthly limits
Beyond the per-transaction cap, daily limits for UK Boku deposits typically fall in the £30 to £40 range, varying based on both your specific mobile network’s own rules and the individual casino’s configuration. Some sources also reference a monthly ceiling around £240, which functions as a further backstop on top of the daily figures.
These layered limits — per-transaction, daily, and monthly — mean that Boku is structurally unsuited to funding a large bankroll quickly, even if you wanted to. The method is built around small, frequent, low-friction top-ups rather than substantial single deposits.
Why network-level caps matter
Unlike a bank card, where the limits are set purely by your bank and the merchant, Boku deposits are additionally constrained by rules your specific mobile network operator applies to pay-by-mobile spending generally, not just gambling-specific spending. This means your actual available limit can vary depending on which network you’re with, independent of what any individual casino advertises as its own cap.
Why these limits exist
A structural safeguard, not just a technical limit
The layered limit structure around Boku deposits functions as a genuine, if secondary, safer-gambling mechanism: because the method is capped so tightly at every level, it’s structurally difficult to use Boku to deposit large sums quickly, even for a player who might otherwise be inclined to chase losses with an oversized deposit.
This is worth understanding as a real, if incidental, protective feature rather than purely an inconvenience — the low ceiling on pay-by-mobile deposits means this particular payment route can’t become the vehicle for the kind of rapid, large-scale deposit escalation that’s more of a concern with instant bank transfer or card methods offering much higher limits.
Practical implications for your deposit strategy
If you’re planning to fund a larger session, Boku alone won’t get you there efficiently given its per-transaction and daily caps — you’d need an alternative method for anything beyond small, incremental top-ups. Understanding this upfront avoids frustration partway through trying to reach a specific deposit total using Boku exclusively.
Practical tips when using Boku
Check your specific network’s limits
Before relying on Boku for a deposit, it’s worth confirming your specific mobile network’s own pay-by-mobile spending limits, since these can differ from the general £30-£40 figures commonly cited and directly determine what you’ll actually be able to deposit.
Keep an eye on your phone bill
Since Boku deposits appear on your regular mobile bill rather than a separate statement, it’s easy for cumulative gambling deposits via this method to become less visible than they would on a dedicated bank statement. Periodically reviewing your phone bill specifically for these charges is a reasonable habit if you use Boku regularly.
Responsible gambling
Using the built-in limits deliberately
Because Boku’s caps are structurally low, some players use it specifically as a self-imposed spending control — choosing it deliberately over higher-limit methods precisely because it makes larger, impulsive deposits impossible by design. This guide is for informational purposes only and does not constitute gambling advice; always check current limits with your specific operator and mobile network. For adults 18 and over only.
Getting help
Free and confidential support is available through the National Gambling Helpline and GamCare.
Conclusion
Boku’s £30-per-transaction and roughly £30-£40 daily caps make it one of the most tightly limited deposit methods available at UK online casinos, a structural feature rooted in both network-level pay-by-mobile rules and the broader principle that gambling deposits shouldn’t be funded via borrowed credit. Understanding these limits upfront helps you plan deposits realistically.
Frequently asked questions
What is the maximum Boku deposit at a UK casino?
Typically £30 per transaction, though some operators set their own lower caps. Daily limits usually fall between £30 and £40.
Does Boku charge my credit card?
No. Boku charges either your monthly mobile phone bill or deducts from available prepaid credit, never borrowed credit card funds.
Why are Boku deposit limits so low compared to other methods?
Network-level pay-by-mobile spending rules apply on top of casino-set limits, and the structure inherently caps how much can be charged through phone billing.
Is there a monthly limit for Boku deposits too?
Some sources reference a monthly ceiling around £240, functioning as a further backstop beyond the daily limits.
Can I use Boku to fund a large casino session?
Not efficiently. Boku’s layered limits make it best suited to small, frequent top-ups rather than substantial single deposits.
Do the deposit limits vary by mobile network?
Yes, your specific mobile network’s own pay-by-mobile rules can affect your actual available limit independent of what the casino advertises.
Written by Aisling Maguire, casino product contributor at Tech Insider covering payment methods across the UK and Irish markets. Our coverage draws on operator and network documentation. Tech Insider’s coverage is independent; we do not accept payment for favourable coverage of any operator.
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