Hey @Denis25! The best first step here will be to ensure bluetooth and VPN is disabled on both phones, and to remove any android apps that might conflict with the Ring app. This will help to optimize mobile device connection and performance with the Ring app. While wifi connection should work, keep in mind that adding an additional device to your network while other connected devices are attempting to stream video can certainly slow down the connection or communication. Great call testing on cell data versus wifi, as cell data can sometimes be quicker to connect. I hope this helps! 