Overview
Zadarma is a veteran European telecom operator that has spent over nineteen years building out a cloud communications platform. The service centers on virtual phone numbers in 110 countries, a free cloud PBX with IVR and call routing, and VoIP calling with per-second billing. With more than two million registered users across 160 countries, it targets remote teams, call centers, and businesses needing local presence without physical offices. The platform also layers in newer tools like AI voice agents, real-time speech analytics, and no-code integrations with CRMs and automation platforms such as n8n, HubSpot, and Salesforce.
What brings Zadarma into the no-KYC conversation is its acceptance of Bitcoin alongside fiat payments, plus its offering of SMS-capable virtual numbers. For privacy seekers, that combination sounds promising. The reality is more complicated: the service demands full account registration, logs IP addresses, and applies soft identity checks at signup. That places it far outside the realm of truly anonymous telephony.
Privacy & KYC
Zadarma falls into KYC tier L4, Soft KYC. That means light identity checks are triggered during account creation, not the heavy document uploads required by financial institutions, but enough to strip away meaningful anonymity. Users must provide a working email address to register, and the platform explicitly logs IP addresses. The cookie consent banner on zadarma.com also makes clear that personal data processing is embedded into normal site operation, with only technically necessary cookies being non-optional.
- KYC tier: L4 Soft KYC, light identity verification on signup
- Email required: Yes, mandatory for account creation
- IP logging: Confirmed active
- Document checks: Required for certain virtual number connections per regional telecom regulations
- Privacy score: 25/100, among the lowest in the directory for a service used by privacy-conscious buyers
The 25/100 privacy score reflects this stack of data collection. While Zadarma is transparent about its practices, the FAQ openly asks "What documents are required?" for virtual numbers, transparency does not equal privacy protection. Users seeking anonymous SMS verification or burner-style numbers will find the registration wall and identity gating insurmountable.
Supported assets & payments
Zadarma accepts both fiat currency and Bitcoin for account top-ups and service payments. The Bitcoin option is notable because it opens the door to pseudonymous funding, though that advantage is largely neutralized by the mandatory email registration and KYC onboarding. There is no evidence of support for privacy-focused cryptocurrencies like Monero or Zcash.
The core product range includes virtual phone numbers (landline, mobile, and toll-free), outbound VoIP calling with unlimited price plans starting around $4 per user monthly, cloud PBX with call recording and speech recognition, eSIM data plans, and an integrated Teamsale CRM. The platform also offers API access for developers to programmatically manage numbers, send SMS, and build telephony workflows. Coverage spans 30,000 numbers across 110 countries, with free incoming calls on most number types except toll-free lines.
Security & custody
Zadarma operates a fully custodial model. Users do not hold private keys to any telephony infrastructure; numbers, call recordings, PBX configurations, and CRM data all reside on Zadarma's cloud servers. The company provides 24/7 multichannel support and emphasizes reliability and call quality, including redundant routing to reduce dropped calls. Security features like call encryption are implied by the VoIP infrastructure but are not highlighted as end-to-end or zero-knowledge.
The API uses HMAC-SHA1 signatures for request authentication, which is standard but dated, SHA1 has known collision weaknesses, though the HMAC construction mitigates practical risk. More concerning for privacy is the centralization of call metadata, recording storage (200 MB to 4 GB depending on plan), and speech analytics data. Users with sensitive communications should assume Zadarma can access contents and metadata.
Who it's for, verdict
Zadarma earns a 3.5/10 overall score in our directory, dragged down by its abysmal privacy score despite decent trust marks. The 75/100 trust score reflects its long operational history, large user base, and established regulatory compliance, but compliance here works against anonymity. This is a legitimate business telephony provider, not a privacy tool.
We recommend Zadarma for small businesses, remote teams, and call centers that need affordable global numbers, PBX features, and CRM integration, and who are comfortable with light KYC. We do not recommend it for journalists, activists, cryptocurrency traders seeking SMS 2FA anonymity, or anyone needing burner numbers or identity-separated communications. The Bitcoin payment option is a nice convenience for crypto-native businesses, not a privacy escape hatch. For no-KYC SMS and voice, look elsewhere.
