I was in 8th grade when the first iPhone was released, and I'd say most people got a smart phone while I was in college. I myself got one in 2012, a nexus 4. Bu

I was in 8th grade when the first iPhone was released, and I'd say most people got a smart phone while I was in college. I myself got one in 2012, a nexus 4. But I think for SMS, the point at which "most kids have a cell with unlimited texting" happened was probably at least around the 2010s. I was late to the trend (poorer family) and got an LG Vu in, oh... say 2009. And I think pretty much all of my friends already had phones with suitable texting plans. But mind you this is high school kids, I have no idea about adult adoption.