Some embodiments of the invention provide devices, systems and methods of coexistence mode switching among collocated transceivers. For example, a method in accordance with an embodiment of the invention includes monitoring reception reliability of a first transceiver in relation to concurrent transmission activity of a second, collocated, transceiver; and based on the monitoring, setting a flag indicating a request by the first transceiver that the second transceiver modify its coexistence mode.