Use the Whole Sensor

Something that really irks me about smartphone OEMs is their choice to always default to a 16:9 image capture ratio even if the sensor itself is not 16:9. You wont have to do anything if you have a smartphone with a 16:9 sensor like the Galaxy S5 or HTC One M8, but if you dont, switching back to standard 4:3 can be beneficial. Shooting in 4:3 on a 4:3 sensor not only gives you access to the full resolution of the camera, but it still allows you to crop down to 16:9 after the fact with more pixels to play with. Didnt frame the shot perfectly the first time? Well if you were shooting in 4:3 and using the whole sensor, you might be able to get a better photo out of your shot.