When I finished my first game following a tutorial on Youtube and exported it with debug keystore, jarsigner etc. and installed it on my phone, everything worked. After the third version, however, the message "App not installed" appeared on my mobile phone during installation. Since I had some debugs in the program that I didn't know how to fix, I thought it was because ... However, when I wanted to install my new app (a 3d game) WITHOUT debugs on my phone yesterday, The same message appeared and even after some newer versions, they ran in the project, but could not be installed on the smartphone .... Can someone please help me I would like the app so much on my phone.