Gone are the days of using a phone just to ring people, nowadays our phones act as second brain allowing us to access a realm of information at our fingertips. You might think that you have just about got to grips with all the functions of your iPhone but
iPhone hack - Take a photo with the volume button - Instead of using the touch circle to snap your selfie, hit the “up” volume button. It lets you hold the phone — and camera — more steadily. - Things You Didn't Know Your iPhone Could Do
If you hold down the capture button, your phone will take a series of rapid shots, or bursts, in quick succession. This is especially useful if you’re photographing a moving subject. Later you can scan through all the bursts and pick your favorite ones.
In your Contacts app, you can enable different vibration patterns for different contacts. This is particularly handy if you keep your phone in your pocket, so you can distinguish hands-free between a pesky email from your boss and a fun text.