For billions of people that default is WeChat/WeiXin and installing it is as much a part of setting up their phone as is plugging in a SIM. I can safely know t

For billions of people that default is WeChat/WeiXin and installing it is as much a part of setting up their phone as is plugging in a SIM. I can safely know that any phone made today will have SMS/MMS capability, and nothing about WhatsApp/WeChat/Messenger/Telegram/...etc