WORKING WITH MULTIPLE DEVICES
With each software update, Apple has found new ways for your Mac, iPhone, iPad, and Apple Watch to work together to help you achieve your goals.
With Handoff, you can complete tasks on whatever device is most convenient to you at the moment, letting you start an email on your Mac, for instance, and finish writing it on your iPhone. Apple's built-in apps that support Handoff include Mail, Safari, Pages, Numbers, Keynote, Maps, Messages, Reminders, Calendar, Contacts, and some third-party apps.
To use Handoff with iOS, you must have a recent-model iPhone, iPad, or iPod touch running iOS 8 or later. Compatible desktop computers include a 2013 or later Mac Pro, or a 2012 or later MacBook Air, MacBook Pro, Mac mini, or iMac running OS X Yosemite. Your devices must be logged in to the same iCloud account, connected to the same Wi-Fi network, and within Bluetooth range of one another (about 30 feet).
When you're writing a text message or looking something up in Safari on your iPhone, an icon will appear in the dock on your Mac indicating that you're using a Handoff-compatible app. Tap the icon in the dock to resume using the app on your desktop computer. Likewise, when you're writing a text on your Mac, you'll see a Messages icon appear on the lower left side of your iPhone's lock screen. Swipe up on the icon to resume the text message. If your iPhone is unlocked, you can double-press the Home button to access the Handoff option in the multitasking pane (as pictured on left.)
You can also make calls on your Mac as long as your iPhone is on the same Wi-Fi network. Just select a friend in Contacts on your Mac and initiate the call.
You can control whether you have Handoff enabled on your iPhone in Settings > General > Handoff & Suggested Apps and on your Mac in System Preferences > General > Allow Handoff.
HANDOFF WITH APPLE WATCH
If you make a Siri request with Apple Watch that it can't fulfill, it will shoot the request to your iPhone. When you see an app icon in the lower-left corner of your iPhone screen, swipe up to use the requested app or service.
With Apple's latest software upgrades, the company introduced an improved AirDrop, letting you transfer files between Macs and iOS devices. To do this, you must have a 2012 model or later Mac running OS X Yosemite and an iPhone, iPad, or iPod touch with Lightning connector running iOS 7 or later.
To start sending and receiving files with AirDrop, enable WiFi and Bluetooth on both your devices and make sure they're within range, but not necessarily on the same Wi-Fi network. On your iDevice, swipe up for Control Center, turn on AirDrop, and choose to let yourself be seen by Everyone or Contacts Only. Next time you have a file you'd like to share, tap the Share icon and choose AirDrop from the list of options.
On your Mac, open the Finder window and choose AirDrop in the sidebar and your device will appear in the window. Drag and drop a file onto your device's icon in the window. Note that if the iPhone or iPad is locked, it won't show up in the Mac finder. If you're receiving a file from someone else, a notification will pop up on your phone, giving you the option to either Decline or Accept the incoming file. If you send a file to one of your own devices logged into the same iCloud account, the file will save automatically.