If you're looking for a camera that is smaller than your phone, but doesn't compromise on quality, then this lovely little Minox 35GL should tick all your boxes. 
 
Small enough to fit in the palm of your hand, the 35GL still manages to shoot full 35mm frames, features a built in light meter, as well as a super sharp lens. This camera compares very favourably with say a Rollei 35, and is far cheaper.