Did you know that there are actually a handful of secret iPhone codes? Well it's true, and the features range from extremely useful (like showing your exact signal strength) to very niche (like displaying your call forwarding status). Here's some of the best ones. Produced by Corey Protin Read more: http://www.techinsider.io/ FACEBOOK: https://www.facebook.com/techinsider TWITTER: https://twitter.com/techinsider INSTAGRAM: https://instagram.com/tech_insider/ TUMBLR: http://techinsider.tumblr.com/