Apps misbehaving? Phone acting sluggish? If you're experiencing any kind of problem with your iPhone, then emptying out the device's RAM can often do wonders. It effectively ditches everything the phone was trying to juggle in its memory at once. Restarting your iPhone is one way of doing this, but there is a quicker option.
Press and hold the Power button as normal until the familiar "slide to power off" option appears. Don't accept the invitation and don't cancel either: Instead, press and hold the Home button. After a few seconds you should find yourself back on the home screen with a fresh slate as far as RAM goes. The same trick works on the iPad and iPod Touch, of course.
Double-tap on the Home button and you can see all of your recently opened apps are still there, but the difference is they will reload when you tap on them. It's not something you should overuse — generally speaking iOS manages memory better than you can ever hope to — but it's a handy option to be able to call on when you need it.
Photo by Michael Hession