The Best Pay by Mobile Slots UK (2025)

Chris Vaughan
Author:Chris Vaughan
Fact Checker:
Craig Hitchings
Last Updated:

Pay by Mobile slots allow UK players to easily deposit into their online casino account using their mobile phone bill or pay-as-you-go credit. This method offers simplicity, instant transactions, and enhanced security.

Smartphone screen displaying Pay By Mobile Boku option

Players making a pay by mobile casino deposit usually are often slots players. Budgeting, thanks to script deposit limits, allows slots players to keep it fun also. Here are some of the top slot games recommended for pay by phone bill casino players.

Starburst (NetEnt): RTP 96.1%, Low volatility. Frequent small wins, ideal for casual players.
Rainbow Riches (Barcrest): RTP 95%, Medium volatility. Classic game with balanced payouts.
Big Bass Bonanza (Pragmatic Play): RTP 96.71%, Medium volatility. Engaging bonuses popular with mobile users.
Gonzo’s Quest (NetEnt): RTP 95.97%, Medium-High volatility. Exciting cascading reels.
Book of Dead (Play’n GO): RTP 96.21%, High volatility. Potential for large wins with high risk.

Starburst Slot reels

Real-World Case Study: Pay by Mobile Slots at MrQ Casino

We personally tested the Pay by Mobile deposit process at MrQ Casino for accuracy and ease of use:

Step-by-Step Deposit Example:

00:00 – Logged into MrQ via mobile browser.
00:20 – Chose "Pay by Mobile" and entered £10 deposit.
00:40 – Provided O2 mobile number and initiated deposit.
00:50 – Received SMS verification and replied "Y" to confirm payment.
01:00 – Deposit instantly reflected in casino balance, available to play.

Slot lobby at MrQ Casino

Case Study Highlights:

For further details, check out our complete MrQ Casino Review.

Summary of Pay by Mobile Slots Information

Aspect Pay-by-Mobile Slots (UK)
What it is Deposit to your casino account via phone bill or PAYG credit; funds arrive instantly and are capped by network limits.
Top slot picks
  • Starburst (NetEnt) – RTP 96.1 %, low volatility
  • Rainbow Riches (Barcrest) – RTP 95 %, medium volatility
  • Big Bass Bonanza (Pragmatic) – RTP 96.71 %, medium volatility
  • Gonzo’s Quest (NetEnt) – RTP 95.97 %, med-high volatility
  • Book of Dead (Play’n GO) – RTP 96.21 %, high volatility
MrQ case study
(£10 O2 deposit)
  • Total time: ≈ 60 s from login to playable balance
  • SMS confirm “Y”➜ funds visible instantly
  • 10 free spins credited, no wagering
  • No tech issues encountered
Key benefits
  • Ultra-quick, card-free deposits
  • Instant play; small network-enforced caps aid budgeting
  • Typically fee-free to players
  • Strong fit for mobile-first casual slots fans
Limitations Cannot withdraw to phone bill; daily limit ≈ £30; some casinos may add a small Boku fee.
Verdict Excellent for fast, secure micro-stakes slot play; pair with e-wallet or bank transfer for cash-outs.

GamblingAuthority Final Verdict

Pay by Mobile slots offer unmatched convenience and secure deposits for UK players, especially ideal for casual or mobile-first slot enthusiasts. Depositing with a phone bill, whether Pay as You Go or Contract, is easy and quick. Its simplicity, security, and responsible gaming features make it a top choice for fast and safe casino payments. Pay by mobile deposits can also be a good choice for Live Casino players, with the in-built budgeting caps and great choice of casinos.

Pay By Mobile Slots FAQs

Yes — you can trigger free-spin bonuses with a Pay-by-Mobile deposit, provided the casino’s bonus terms list phone-bill payments as an eligible funding method. Most UK sites that support Boku, Fonix or Siru credit free-spin packages automatically once your deposit clears, but a minority exclude carrier-billing because the operator absorbs a 10–15 % processing fee.

You cannot withdraw via pay by mobile or phone bill. To withdraw winnings, at top casino sites you will have a variety of options, such as PayPal, Visa or Mastercard and e-wallets.

Yes, your funds can be used on all available slots.

Reputable online UK casinos charge no fees. Always check the terms.

Typically, yes. Most casinos fully include mobile deposits for promotions.

Withdrawals require an alternative payment method like bank transfer or PayPal.

Chris Vaughan
Chris Vaughan Senior Writer & Editor
63 Articles 2 Reviews

Chris Vaughan is a Senior Writer and Editor at GamblingAuthority. He has more than 18 years of experience in the iGaming industry and has great knowledge of game developers, trending games and casino research.

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Last Updated: 8 July 2025