Instructions to make video calls on HTC devices

HTC Desire 816G dual sim HTC Desire 816G dual sim
HTC Nexus 9 HTC Nexus 9
HTC Desire 620 HTC Desire 620
HTC Desire 620G dual sim HTC Desire 620G dual sim
HTC Desire 320 HTC Desire 320
HTC Desire 826 dual sim HTC Desire 826 dual sim
HTC Desire 526G+ dual sim HTC Desire 526G+ dual sim
HTC Desire 626 HTC Desire 626
HTC Desire 626G+ HTC Desire 626G+
HTC Desire 820s dual sim HTC Desire 820s dual sim
HTC One M9 HTC One M9
HTC One E9 HTC One E9
HTC One E9+ HTC One E9+
HTC One M8s HTC One M8s
HTC One M9+ HTC One M9+
HTC Desire 326G dual sim HTC Desire 326G dual sim
HTC Desire 820G+ dual sim HTC Desire 820G+ dual sim
HTC One ME HTC One ME
HTC Desire 520 HTC Desire 520
HTC Desire 526 HTC Desire 526