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The iPhone's stock Calculator app has gotten a bit of press lately for its swipe-to-delete gesture, but it's been a longtime workhorse on the iPhone — in fact, it's been around since the launch of Apple's very first model in 2007.

By accessing the hidden iPhone field test mode you’re able to find out live updated information about your cell phone network. You can uncover the numerical value of your cell phone signal and read data about surrounding cell towers. If you tap on the n