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The PDF, or Portable Document Format, was designed as a reliable way to exchange documents independent of software, hardware or operating system. As such, it is has become a popular method of sharing a variety of documents, including photos. You can put your photos in a PDF and share them from the Photos app on your iPhone or iPad, though the feature is not at all obvious as it is found under "Print" in the sharing options. Here's how to put your photos in a PDF file and share it on iPhone or iPad:

Running out of storage space is a perennial problem for anybody who uses any mobile devices, including iPhones and iPads, especially if they are older models. If you have deleted all the photos, videos, movies and songs that you are willing to and you still need more space, some of the iOS native apps take up a surprising amount of space:

Your iPhone's clock by default automatically syncs with your carrier's network time, which is probably what you want ninety-nine percent of the time. If you need to know the time elsewhere in the world you can simply check the Clock app's World Clock feature with a few taps. There may be times, however, when you want your iPhone's main clock to show a time other than local - maybe while you are travelling you want to know the time at home at a glance. Perhaps you are somewhere without service and your phone can't sync, or the network time is wrong for some reason.

The Shortcuts app contains a gallery of many pre-defined programs that use one or more apps to achieve a desired result. For example, the Directions to Next Event shortcut uses the Maps and Calendar apps to quickly provide you with directions to your next calendar event. Aside from the shortcuts provided in the app, there are many avid users who share their creations online in communities such as Reddit and Sharecuts.

iOS 12's Shortcuts app has hundreds of useful shortcuts meant to make a variety of different tasks easier to accomplish on your iPhone. A reboot of the old Workflow app, Shortcuts has a gallery of pre-programmed 'recipes' that are basically small programs that use one or more apps to achieve a desired result. For example the Remind me at Home shortcut will remind you of a task as soon as you get home by using location services, Maps and Reminders. You could set this up yourself as a location based reminder, but the shortcut makes it considerably quicker and easier to do.