Got ya. WhatsApp works.Don’t over complicate it... use your phone. Plenty of options. Video chats, FaceTime, discord, zoom, Skype.
Using iPhone… The problem I’m having is bright glare. No idea how to make adjustments.I've done lessons with Zoom. It doesn't require participants to have an account. It was pretty easy. It also doesn't require cameras on both ends and the instructor usually doesn't need one.