I couldn't live without SMS and navigation, so I kept my smartphone and just disabled my browser and removed all social media apps. Occasionally I have to re-enable my browser to scan a QR code (including for parking as the article mentions), which annoyingly reminds me how to circumvent this restriction, but it hasn't really been a problem so far. I already had Kindle on my phone, and I also installed the Wikipedia app and Dropbox so I can quickly look up facts, browse articles, or read a book or paper when I have nothing else to do. The main effect is that I spend most time on my phone reading stuff I actually want to read instead of aimlessly browsing the web.