How does a missed call service work technically and why does it cost nothing for the caller?

A missed call service works by providing your business with a virtual phone number connected to a telephony platform. When a user dials that number, the platform answers the call instantly (within 1–2 rings) and immediately disconnects it before the call is connected — so the caller never uses any call credit or airtime, because the call never actually connected to a live destination. The caller's mobile number is captured in the split second between the incoming call being received and being disconnected. The platform then triggers whatever response action is configured — sending an SMS, triggering a WhatsApp message, creating a CRM lead record, calling the caller back, or posting a webhook to your API — within seconds. Because the call is disconnected before it connects, the caller incurs zero call charge regardless of their network (Airtel, Jio, Vi, BSNL) or calling plan. This zero-cost-to-caller mechanism is what makes missed call the highest-response lead generation channel for mass-market Indian audiences, particularly feature phone users and users with limited call balance.