This well kept secret surfaced just recently. All Apple devices running iOS 7 have a pretty darn well hidden Easter egg. Just follow this step-by-step instructions carefully and the very first Mac OS version 1 will appear on your iPhone or iPad. How freaking awesome is that?
Windows Phone 8 powered phones come with the Microsoft Office apps and Excel being one of them. Let's learn how to use a simple but useful sum formula to add up the values.