That's not the point I'm disagreeing with though, it's just a reminder that the claim that "most people" own an iPhone is delusional. It's just as ridiculous as someone only hanging out with billionaires claiming "most people fly private jets", and it can be healthy to consider the rest of the world from time to time.
I live in Europe and while iPhones aren't uncommon they don't have the status they (seem to) have in the US and most people use Android.
1. SMS do not support group messaging. An SMS with multiple receivers is just multiple copies of a 1-to-1 message. The other recipients don't know about each other.
2. SMS do not support images or videos.
Maybe you're talking about MMS, but I've always found that clunky. I'm not sure why. Part of it is that it goes over a seldomly-used separate type of connection (at least with 3G and earlier technology) which isn't as reliable as plain TCP.