Why doesn’t every app vibrate?
Q When my iPhone 5 is set to silent mode, I still get vibrate notifications for some apps, such as Facebook, but most of my other apps don’t alert me at all. I have checked that I have sounds enabled in each app’s notifications settings but it doesn’t make any difference. Clara Dacey
A Indeed it doesn’t. You can only get vibration notifications if the app is written to allow them. This is a design decision for an app’s developers, and the only way to get it changed is to petition them and ask for the feature to be added in a future update. This might not work though because I think that Apple’s App Store criteria discourages apps that unnecessarily bombard you with notifications, particularly when you have muted your phone.