So you think you’re a smartphone expert. You know your iPhone or Android phone inside and out and you constantly help your friends and family with their mobile problems. Well, we hate to break it to you, but there are still plenty-of things that even the savviest smartphone users out there don’t know about. For example, did you know that your iPhone or Android phone has tons of secret hidden menus that you can only access by dialing special codes into the phone app? DON’T MISS: Samsung-Galaxy S6 review Older cell phone users out there may remember the days of dumb phones, when a phone call to customer service would end with a rep instructing you to dial a bizarre

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