iVRy is described as 'SteamVR-compatible Virtual Reality headset app for your Android device with a native high-performance driver for Valve's OpenVR / SteamVR'. There are four alternatives to iVRy for a variety of platforms, including Android, Windows, HTC Vive, iPhone and Linux. The best alternative is VRidge, which is free. Other great apps like iVRy are TrinusVR (Freemium), VirtualCheap (Free, Open Source) and Phone VR (Free Personal, Open Source).
The Android client for OpenVRCardboard (AndroidApp is intended to send gyroscope data to a socket server ) Socket server for recieving data from android OpenVR driver to exchange data between android and steamvr on pc, main target is linux.
Use Steam VR-enabled applications with your phone as HMD (Head-mounted display). The only Open-Source solution to similar commercial packages like VRidge, Riftcat, Trinus etc etc. (https://github.com/ShootingKing-AM/PhoneVR).