Worth noting that RCS is a similar shit show. When I opted into this when I had an Android temporarily, it broke (some) SMS for iOS when I moved back. I had to

Worth noting that RCS is a similar shit show. When I opted into this when I had an Android temporarily, it broke (some) SMS for iOS when I moved back. I had to set the android handset up again, log in with my google account and deregister it, then flatten the android handset again. This was ironic in a way because I was just trying to activate WhatsApp with SMS so I didn't have to use SMS/RCS/iMessage!