Some of my research gave me the impression that Android has a way of blocking texts from emails, but iPhone doesn't have a good way. I don't have an android, so I could be wrong...I can't say that neither the wife nor I get spam text messages. Maybe Android phones have an advantage?
We do get the occasional spam phone call. Oddly, we've not received one about warranties in a while, but the wife keeps getting some with a recorded voice informing her that if she doesn't take "their recommended action," there will be legal ramifications.