I did this back in 2012 after using Android and iPhone for the previous 4-5 years and despite really finding it a good experience, even then it was becoming difficult to live without maps and a camera. I've been thinking about it again, though, and the one thing I've tried to find is a decent keyboard phone for texting. I don't mind going without a browser, etc. on my phone, but I do find communication via text to be valuable and I don't want to go back to T9 or a phone keypad to try to do it.