MobilDiafon replaces the decades-old wired intercom with a phone-based one. No cabling, no panel per apartment — a visitor scans a QR (or finds the building by location), video-calls the resident, and the door opens remotely, set up in minutes. Unlike traditional systems, it unites managers, security and residents in one platform, works with Shelly smart locks, and adds "Auto" QR verification for vehicle entry. Digital, wireless, manageable building access — from apartments to plazas.