What are the apps that you are constantly using on your iPhone? The ones that you find yourself using most of the time without even realising? Mine would have to be the following... 'Spending' - To keep track of my income and expenses. 'iBooks' - For my general reading purposes. 'Facebook' - Just because it seems to be the only way to communicate with people these days. What about you guys and gals? Would like to hear if you have any cool hidden gems that you could share!