Next up is the action button, up on the left-hand side as you look at the iPhone, which has replaced the old ring / silent ...

Restarting your iPhone is usually the quickest cure for everyday annoyances, from apps freezing up to network hiccups. In fact, you should probably be restarting your iPhone more often than you think.

If you like the security of a physical button to feel for on your iPhone, you might need to adjust to a new style.