To remotely access your Android phone from another Android phone, you can use a remote access app such as TeamViewer, AnyDesk, or Microsoft Remote Desktop. These apps allow you to control one phone from another, as long as both phones have the app installed and are connected to the internet.
Once you have the app installed on both phones, you simply need to set up a remote connection by following the app's instructions, and then you can control and access your Android phone from the other Android phone. This can be useful for troubleshooting issues, accessing files or apps on your phone remotely, or even just checking in on your phone when you're away from it.