The more megapixels you have capturing bits, the more megabytes your photo consumes. iPhone 4 pictures (2592x1936, 5 megapixel) are usually around 2-2.5MB, while iPhone 3GS photos (2048x1536, 3 ...

The iPhone XR's portrait mode has one big limitation: it only works on humans in the default camera app. If you try taking a photo of pets or objects, it won't generate the effect.

Tap the "Camera" app from the home screen. Point your iPhone at the subject you wish to take a picture of and tap the "Camera" icon located at the bottom of the screen.

2. Exposure/Focus lock. Even iPhone users who have taken thousands of photos over a period of years are often unaware that the iPhone camera allows users to lock both the exposure and focus settings.