I've never understood why people bother with cases, when they have perfectly good trouser pockets. Cases are for wimps who don't use their device enough! :-)
I carried a Psion 5mx in my left trouser pocket for 20 years; I was always whipping it out to make a quick note, check my agenda, look something up in Wikipedia, play games, read books, &c. And now my Gemini does all that and is my phone and web browser and stuff too. There simply isn't time to faff around with cases when it's ringing...
(Of course, this only works if you wear trousers that have suitably-sized pockets. But most trousers do, these days -- partly because most people have phones.)