Hiya is a mobile app that blocks spam calls and identifies unknown callers. It functions by accessing a large database of known spam numbers and caller ID info. When a call is received, Hiya checks the number against its database and notifies the user if the call is likely spam or fraudulent. The app also offers caller ID services to help identify callers even if their number isn't saved in contacts.

Hiya provides a free version along with a premium subscription. The free version offers basic features like spam call blocking and caller ID. For advanced features such as detailed caller profiles, automatic updates, and enhanced protection against fraud and nuisance calls, users can subscribe to Hiya Premium, which involves a fee.

Hiya needs access to your phone contacts, call log, and permission to make and manage calls. These permissions enable it to deliver accurate caller ID and spam protection. Hiya emphasizes privacy and states that this data is used solely to improve service quality.

While Hiya is very effective at blocking known spam calls using its extensive database and machine learning, it cannot guarantee 100% effectiveness due to constantly evolving spam tactics. Users can manually block certain numbers, and Hiya regularly updates its database to enhance protection against new threats.

Yes, Hiya is accessible on both Android and iOS platforms. The app can be downloaded from the Google Play Store and the Apple App Store, providing consistent spam protection and caller ID services across both operating systems.