Siru Mobile Casino Deposits: How to Pay by Phone in Seconds (UK 2025)
Siru Mobile is the Scandinavian-born carrier-billing platform that lets UK players place small pay by mobile casino deposits using nothing more than a phone call or SMS. Unlike Boku or Fonix, Siru was built for micro-payments first, which is why you’ll see ultra-low minimum stakes (as little as £1) and a slightly different confirmation flow. This guide explains exactly how Siru works, what limits and fees apply, and how it stacks up against the better-known Boku and Fonix options.
What Is Siru Mobile?
Launched in Finland in 2011, Siru Mobile entered the UK market in 2017 with FCA permission to operate “payment initiation” via carrier billing. The company partners directly with EE, O2, Vodafone, and Three, plus major MVNOs, to route small transactions through your phone bill. While Boku relies on SMS confirmation, Siru’s signature move is the one-ring callback: after you enter your number, Siru places an automated call that disconnects immediately; answering (or simply letting it ring) confirms the charge.
How Siru Mobile Casino Deposits Work: Step by Step
- Select “Siru Mobile” in the casino cashier.
- Enter your mobile number and the deposit amount (£1 – £30).
- Receive an instant call from a UK shortcode; answer or let it ring out – that’s the confirmation.
- Deposit credits instantly; funds appear in your casino balance.
- Charge shows on your phone bill (or is deducted from PAYG credit).
Siru Mobile Casino Limits & Fees
- Minimum deposit limit: £1 (industry-lowest).
- Maximum single deposit limit: £30.
- Daily cap: £30; monthly: £240 (PSA standard).
- Typical fees and surcharge: flat £1 or 15 % — because Siru’s commission to casinos hovers around 15 %. Many operators offset this by passing on a visible fee.
Supported Networks
EE, O2, Vodafone, Three, plus MVNOs such as Giffgaff, Tesco Mobile, Sky Mobile, Smarty, VOXI, and ID Mobile. Contract users must have premium billing enabled; PAYG customers need enough airtime to cover both deposit + fee.
Pros & Cons vs Boku / Fonix
| Feature | Siru Mobile | Boku | Fonix |
|---|---|---|---|
| Min. deposit | £1 | £5-£10 | £5-£10 |
| Confirmation | Instant phone call (no SMS) | SMS “Y” reply or PIN | SMS or browser PIN |
| Typical fee | Flat £1 / 15 % | Usually zero | Usually zero |
| Deposit speed | Instant | Instant | Instant |
| Ideal use-case | Ultra-small stakes, testing a new casino | Standard £10-£30 top-ups | Higher daily cap (£40) at some sites |
Key Takeaways
- Siru Mobile offers the UK’s lowest minimum stakes (£1) for pay-by-phone deposits.
- Expect a flat £1 or ~15 % fee at most casinos – higher than Boku/Fonix.
- The signature “one-ring” call confirmation skips SMS and works even with poor text delivery.
- Ideal for micro-testing a new site or casual spins; less suited to sustained high-volume play.
Siru Mobile Casino Payments FAQs
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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