I’m aware of few people who use SMS in Europe, and very few people who use it as their primary means of texting; I’ve even seen people outright ask that they not be sent SMSs. WhatsApp is almost ubiquitous, and it often feels like it’s assumed everyone has it, even if they don’t use it as their primary texting method.
It does seem very common in the US, however.
The US Bill of Rights only includes the first 10 amendments, so the 25A isn’t included. It also doesn’t itself contain “unalienable”, that being only in the Declaration of Independence, and in the discussions around the proposal of the amendments.
While the whole unalienable rights of all people that we’re just stating as one country rather seems like Enlightenment ridiculousness and extremely pretentious, and I’ve certainly seen interpretations that are extremely hegemonic, such as arguing that the US Bill of Rights applies to all countries, it doesn’t include later amendments.