PhoneBlock review
Broad, free spam-call blocking with self-hosting and telephone-system support.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
PhoneBlock is a free, open-source spam-call filtering service for individuals using landlines, Android phones, iPhones, and telephone systems. It combines a community-reported blacklist with automatic updates, known-spam call blocking, caller identification, and personal blacklist and whitelist controls. Its deployment options extend from web access and mobile platforms to an API and self-hosted operation, making it suitable for users who want control over how call filtering is delivered.
PhoneBlock’s strongest fit is its breadth across devices and phone systems. Android users can filter calls before the phone rings and review blocked and missed calls in the call history. iPhone users can identify spam callers by synchronizing the blacklist through CardDAV. Telephone-system and PBX support adds a path for broader deployments, while 3CX integration and the API provide additional connection options. Users can also search for and report phone numbers, contributing to the community blacklist.
The product is free of charge and has no paid tier to compare, which keeps access straightforward for individuals and organizations evaluating open-source tooling. The trade-off is that iPhone support currently uses CardDAV synchronization because the native iPhone app is still under development. PhoneBlock is a strong choice for open-source users who need Android, iPhone, landline, PBX, or self-hosted options in one service. Those seeking a native iPhone app should consider an alternative until that experience is available.
PhoneBlock pros and cons
- Where it wins
- Free open-source blocking across phones, web, API, and self-hosting
- Community blacklist updates with automatic known-spam call blocking
- Supports Android, CardDAV, 3CX, PBX, and telephone-system integration
- Where it doesn't
- iPhone support currently relies on CardDAV rather than a native app
- Community blacklist coverage depends on reported spam numbers
- Setup can be more involved when using PBX or self-hosted deployment
PhoneBlock fact sheet, pricing and score →
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