My Argentinian friend in Austria has some top-notch private medical insurance where he sent them pics of his semi deep cut injury on whatsapp, a doctor came to his place one hour later.

My dermatologist also offers a whatsapp address where you can talk to her assisstant.

My GP communicates via iMessage.

Singapore. Rent a place with all communication and signing contract via Whatsapp with agent.

I communicate with my dentist on WhatsApp. They send me appointment reminders the night before and I have to confirm.