Yes, you can use Apple Airpods with any Samsung mobile phone, which has Bluetooth 4.0 or higher connectivity option.
If you do not want to use your AirPods with your iPhone, you can disconnect them easily. Follow below steps to disconnect AirPods with the iPhone.
Step 1: Go to Settings
Step 2: Tap "Bluetooth"
Step 3: Tap "information button" besides your AirPods
Step 4: Tap "Forget this device"
Yes, you can connect Airpods with iPhone 6.
You can use Apple AirPods with your Android phones. Check this video to know more on how to connect your Android phone with Apple AirPods.
Look past their offbeat design and you'll find that Apple AirPods' compact size and high convenience factor are a winning combination.