Continuity and Handoff are both new iOS 8 and OS X Yosemite features that make for a more seamless multi-device experience than ever before.
Continuity lets you answer phone calls that come in on your iPhone on your iPad, and Mac running OS X Yosemite (10.10). Handoff, one of the major elements of Continuity, lets you start a task on one device, and pick up where you left off on another. Unfortunately, some devices seem to be having issues… Luckily, there’s a pretty easy fix that worked for me!
How to fix Continuity and Handoff issues with iOS 8
Launch the Settings app on your iPhone or iPad running iOS 8.
Tap on General.
Tap on Handoff & Suggested Apps.
Turn the Handoff option Off and then back On again.
Tap General at the top to return to the previous menu.
Tap Settings at the top to return to the previous menu.
Tap on FaceTime.
Turn the iPhone Cellular Calls option Off and then back On again.
You can Reboot your iPhone or iPad if it didn’t work right away.
Repeat this process with every device you’d like to use that is not showing handoff apps like safari or mail in the app switcher (Left of Springboard).