Not related to phone companies, but some software companies were in denial about it. I remember purchasing one of the first HTC/Android smartphone, and I told my boss at the time that my new cheap phone could replace all the applications of the company but cheaper, more convenient, in my pocket, and without a computer. He made fun of me and laughed. I knew Java pretty well and whipped up a few POCs to see by myself if we were really doomed, but I didn't told anyone about it. In less than 2 weeks I replace the whole company with 2 or 3 applications with crappy UIs. I quit in less than a month and the company obviously closed soon after that because that was the only sensible thing to do.