The core activity of 4z.com is the provision of Voice-over-Internet-Protocol (VoIP) services, including phone numbers, call services and anti-fraud protection solutions for private and business customers. The company offers affordable rates for calls to many countries, including free calls to 54 countries, as well as per-second billing without connection fees. Additionally, 4z.com provides anti-fraud services for telecommunications providers to detect and prevent fraudulent calls in real-time.