Yes, you can control the volume from the phone using the phone's volume buttons just like we do in case of any other headphones.
Yes, Apple Airpods are compitable with Samsung Galaxy S7 Edge.
Yes, Apple Airpods are compatible with Macbooks.
To pair the AirPods with your Android phone - please follow the below steps.
01) Press the button in front of the charging case until the light blinks.
02) Go to Bluetooth Settings (on your phone) and choose AirPods
Look past their offbeat design and you'll find that Apple AirPods' compact size and high convenience factor are a winning combination.