Wide Angle Lenses are very good at bringing your subject closer to you. This is a bit different than shooting with macro lenses where you can fill the image with your subject. For example, you can photograph a flower in a field. This flower can be in the foreground and be your main subject. The bonus is that because of the angle of view covered by the lens, you can see the fields, hills, farmhouse in the background. In the same macro shot you may have just the flower fill the image.
Wide Angle Lens on DSLR
It is a different thought process when shooting with an ultra-wide lens. The lens I have access to now is a Canon 10-22mm on a Canon crop-sensor camera body. This is the lens that probably stays on the camera body the most. It has an equivalent focal range of 16-35mm (for a 35mm camera or full-frame sensor).
Wide Angle Lens on Camera Phone
My favorite wide angle lens on a camera phone is still the Nokia Lumia 1020. It has a 41MP (2/3") sensor with Carl Zeiss Optics with a constant aperture of f/2.2 and fixed 26mm lens. It is a quirky device. It was designed with such a high resolution to avoid having to physically zoom-in. The idea was you can crop the image and still have a usable image. I never use the camera thinking that I would crop the image and "post-crop".
This camera reminds me of the Nikon 5000 ("pre-dslr" camera) which also had a 2/3" sensor and had crisp color and focus. I think some people refer to them as bridge cameras.