I came from the Moto X to the LG G3 and I find that the vibration when set to "vibrate" mode on the phone is so weak that I would miss calls or text messages if I did not have the Pebble watch to alert me. I have set the vibration to strong in both my message app and all of the other apps yet I still can't hear the vibration while at my desk. When the sound is set to normal and notifications are set to all the way up, then I can feel the vibration. If this was in my pocket and I did not have the watch, I would miss text messages and calls. This is really the only complaint I have so far with the phone and I guess this is minor in the long run, however, I am thinking of returning the phone. I know that there is no way to change this.