While your statement was true regarding phone (and WhatsApp) being a lifestyle choice, it has become a critical requirement for participating in the society.
In India, every little thing now requires WhatsApp. Want to contact your doctor, lawyer or want to get receipt? Good luck if you don't have a smartphone and WhatsApp.
So not having WhatsApp is not a choice. Believe me. I have been running GrapheneOS, WhatsApp free. It is so hard.