Bluetooth mic does not work on Android phones

[AC Question]

Hi, I have a Motorola T505 bluetooth car speaker. This device works fine with my both old phones (HP ipaq 514, HTC Sprint Mogul - both Windows). When I connect this device to any android phones (Moto X Play, Samsung S duos, Nexus5) the person on the other side cannot hear me. I can hear the other person perfectly.
What could be the reason ?