Flip phones have some of the best protections available: the sensors aren't there. You can't leak your location if there is no GPS module in your phone, you can't have your camera hacked if there is no camera and so on.
I'd prefer all this stuff came with physical switches so it can be enabled/disabled in a hack-proof manner.
I'd prefer all this stuff came with physical switches so it can be enabled/disabled in a hack-proof manner.