Handoff is a feature of iPhones, iPads, Apple Watches, and Macs that lets you start something on one device and then complete it on another. For example, you might start reading a web page on your iPhone and then realize you’d rather kick back and read on your iPad or MacBook. With Handoff, making that switch is a cinch. No more noting down the URL or emailing it to yourself for opening on a second device.
You will need to meet a few prerequisites for using Handoff. Both devices must be on the same Wi-Fi network, have Bluetooth turned on, and be signed into the same iCloud account. Assuming your devices meet those conditions, using Handoff is easy. Apple’s first-party apps like Safari, Mail, Messages, and Pages all support Handoff right off the bat. Third-party developers can add support for Handoff as they see fit. No matter which app you’re using, using Handoff is the same.
Enabling Handoff
First, let’s make sure that Handoff is turned on. You’ll need to turn it on on each of the devices you use, including your iPhone, iPad, Mac, or Apple Watch.
Enabling Handoff on your iPhone or iPad
Open up your Settings app and tap the “General” option.
On the General page, tap the “Handoff” setting.
Flick the toggle to turn Handoff on (or off if that’s what want).
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Source : How to Set Up and Use Handoff on Your iPhone and iPad