My phone will vibrate on call connect if the phone was not at my ear.
In other words, if the proximity sensor is covered, the phone will not vibrate on call connect. If the sensor is NOT covered, it will vibrate on call connect.
HTC One (m8)
Tornado, Trinity (sold) - Kaiser (sold) - Diamond (sold) - Topaz (sold) - Leo (broke!) - Pyramid (sold) - EndeavorU - (sold) - M7 (sold).