How to Run a Phone Security Camera When You Cannot Access Your Router

A technical guide addresses a common gap in DIY phone-as-security-camera tutorials: most assume the user can log into their router to reserve a static IP address, which is not possible for renters, shared households, or managed building connections. When a phone joins a Wi-Fi network, it receives an IP address via DHCP, a protocol that attempts but does not guarantee returning the same address after a lease expires or the router reboots. This means a saved browser bookmark to the camera feed can silently break without any change on the user's part. The guide proposes three router-free workarounds: reading the phone's current IP directly from the device, keeping the phone continuously connected to prevent address rotation, and manually assigning a static IP on the phone as a last resort — with a warning that this carries risks on networks the user does not control. Crucially, none of these address issues affect video recording itself, which is stored locally on the phone and does not depend on the router.