Aiphone Corp. now has a mobile app available to new and existing installations of the popular GT Series multi-tenant video intercom. The convenient app will enable users to screen visitors directly from a smartphone, whether at home or away. The app, which requires the new GT-TLI-IP mobile app network adaptor, allows tenants to use smartphones to answer calls and unlock doors; view video and conduct two-way conversations in Wi-Fi, 3G or 4G communications.