Vibrate not working with text messages

[Pebbles]

Then you may need to do a hard reset to get the vibrate working when receiving texts. As for increasing strength of vibrate I don't think that is a feature on any phone but a hack can be done to change the vibrate pattern I am sure. My old flip phone could be set for example to vibrate three short bursts if it was a text... three long bursts if a voice call, etc.