Since the release of Mac OS X Yosemite and iOS 8 in late 2014, you can use Continuity to hand off a task from one device to another. So, for example, you can start an email on your MacBook and finish it on your iPhone, or vice versa. You can also use Instant Hotspot to connect your Mac to your iPhone's Wi-Fi.
Continuity is unquestionably handy, but one thing bugs me: I hate receiving phone calls and texts on my iPhone, iPad, and Mac when they're connected to the same Wi-Fi. The cacophonous chorus of notifications coming from all those devices undermines the convenience of answering a call on another device when your iPhone is not accessible. Also, you may not want to get personal calls and messages on a device you share with your family or another person. Here's how to disable calls and messages in just a few steps.
Disable calls on your iPad and iPod Touch
On your iPad or iPod Touch, head to Settings, then FaceTime, and toggle off Calls From iPhone.
Disable calls on your Mac
Open FaceTime from your MacBook's or desktop's dock. Then open FaceTime's menu from the top left corner of the screen. Click Preferences to open the Preferences pop-up, and in the middle you'll see Calls From iPhone. Uncheck that.
Disable texts on your iPad, Mac, or iPod Touch
Head to Settings, Messages, then Text Message Forwarding. Under Text Message Forwarding, toggle your other devices to off.