The problem with that approach is that in Europe (at least parts of it, I'm from the Netherlands and this probably doesn't apply to every single country), "text

The problem with that approach is that in Europe (at least parts of it, I'm from the Netherlands and this probably doesn't apply to every single country), "text messaging" was largely replaced by WhatsApp. Getting someone to contact you over SMS instead of WhatsApp already requires a change in behavior. Once you have to explain to someone why you want them to contact you through something other than WhatsApp, the SMS angle is already irrelevant.