I have a dash cam with audio, but it only has a few hours of footage. I'd like to store massively more than this for potential protection against pax nonsense. It sounds like android's background video recorder set to low resolution could record interior vid and audio best (iphone has no such app), because its bitrate is terribly low. If I buy an android phone only for this, what's probably the bare minimum to have the app function usable? I know a pre-pay android can be had for almost nothing, and I have no intention of actually activating it.