I'm not saying it's not used, but it's mostly used one way (I receive SMS's but never send any) and irrelevant for modern instant messaging. The common denomin

I'm not saying it's not used, but it's mostly used one way (I receive SMS's but never send any) and irrelevant for modern instant messaging. The common denominator where I live is Whatsapp. If you send an SMS to someone, they will very likely not reply. In other countries it can be WeChat, LINE, Kakaotalk, ... and Signal is competing in this space.