Ok, silly American here. When I lived in Europe, we always used WhatsApp. But in the us, its sms mostly. I see the comment to "replace sms with WhatsApp," and want to make sure I understand a few things: -While WhatsApp is a great channel, and in most places is used more than sms, it will not communicate with someone who has sms, only WhatsApp? -been looking at the packages for Waghl & app level and really nice, but do you need to upgrade to the ghl for WhatsApp. I've seen it said that it runs on the SMS rail in ghl(sorry crypto term)