In iOS8 and OS Yosemite, Apple introduced a new feature which allows you to answer phone calls on your iPad and your MacBook. While this is a cool feature, I don't really see the necessity of it, since you pretty much have your phone with you at all times, or at least most people I know do.
Yesterday, and my grade one class, we were watching a YouTube song, and the class was singing along. While, I don't usually receive too many phone calls during the day, I did this time. Unfortunately, the iPad stopped playing the video, and began to ring, over the speakers. This was just slightly distracting and not very good for the flow of the class. I ignored the call but wanted to figure out how to disable this.
It is an easy fix. All you need to do is go to Settings>General>FaceTime and then switch iPhone Cellular Calls to “off” (the left position).
I'm not sure how many people would benefit from the ability to answer calls on the iPad. For someone who works at their desk all day, it might be time efficient to talk on your Mac. But for the small exception of being on your iPad while your iPhone is in another room, not many people will use it, in my opinion. Especially if you have young kids at home, having all your devices ring at inopportune times is probably not going to go over well. It might be a cool feature at first, but probable an unnecessary one.
Check out the official video from Apple describing this feature: