Q: My iphone 6 plus is not vibrating

Hey Sam,

Welcome to Apple Support Communities.

It sounds like your iPhone 6 Plus isn't vibrating when you put it in silent mode. Take a look at the article linked below and verify that the vibration settings are configured in the way that you want them to be configured.

Change sounds, ringtones, and alerts on your iPhone, iPad, and iPod touch - Apple Support

If the device isn't behaving as expected after verifying the settings, try the troubleshooting suggestions in this article:

Get help with buttons and switches on your iPhone, iPad, or iPod touch - Apple Support

Take care.