SimNoKYC: the cheapest honest way to put a phone number into a form that demands one.

How it works

SimNoKYC is a virtual-number service with an unusual authentication model: you do not sign up. The server generates a 16-character seed phrase and that seed is your account. There is no email, no password, no username. Write the seed down or lose access — there is no recovery flow.

Funding happens in crypto. Fourteen rails are accepted at the swap layer (BTC, XMR, ETH, USDT, USDC, XRP, LTC, SOL, TRX, TON, DOGE, POL, BCH, DASH), settled to the operator through FixedFloat. The first deposit clears at a $75 minimum — not a fee, but a balance load that sits on the account and pays for SMS as you consume them (typically $0.20 to $1 per OTP). Subsequent top-ups can be as low as $1.

Two modes are supported: per-OTP (single SMS delivery, twenty-minute validity, auto-refunded if no message arrives) and number rental (7, 14, 30 or 90 days, dedicated number, unlimited incoming SMS for the rental window). Both modes draw from the same balance.

KYC & privacy

SimNoKYC collects no personal data at signup: no email, no government ID, no phone number of your own, not even a chosen username. The only identifier is the seed. Crypto payments are pseudonymous; settlement runs through FixedFloat with per-invoice deposit addresses, so on-chain heuristics see a churn of one-shot wallets rather than a stable customer ledger.

What the service still knows: which numbers you rented, from which carriers, and for how long — operating the rental inherently requires that lease record. The metadata is bound to the seed, not to a person. There is no published no-logs policy, no .onion mirror, and no third-party audit. The privacy posture rests on what the service refuses to ask for rather than verifiable guarantees about what it stores.

Strengths and limits

The strengths are structural. The seed-phrase model means a coerced SimNoKYC disclosure returns a hash and a wallet address — neither of which unmask the user. The catalogue is wide (190+ countries, 1,000+ destination services per the homepage), the pricing page is plain — no hidden fees, no loyalty pressure, no dark patterns — and the auto-refund on failed delivery is the honest behaviour most competitors promise and few actually ship. A more recent addition is the public Agent API — an MCP server at /mcp, a REST surface at /api/v1/ documented by an OpenAPI 3.1 spec, and a /.well-known/agent.json discovery file — letting AI clients (Claude, Cursor, Continue, OpenClaw, curl) buy verifications end-to-end without a human in the loop.

Limits are real. Short service history, closed-source backend and no audit make parts of the trust stack unverifiable. The mandatory $75 first-load is high for users who need a single OTP and will not return. USDT support is ERC-20 only (no TRC-20, BEP-20, SPL). Lightning is not supported. Carrier blocks remain the main failure mode — most failed OTPs are upstream refusals from the target service, which SimNoKYC cannot control and is transparent about.

Verdict

SimNoKYC is the cheapest honest way to put a phone number into a signup form that insists on one, for users willing to manage a seed phrase, settle in crypto and load a starting balance. The new agent-purchasable API extends the same posture to autonomous clients. A longer public track record and a transparency report would push this review toward B+. Until then, the grade reflects what the service is today: functional, privacy-native and fair on the parts it controls.