In general, I agree with many commenters here. Separate devices with dedicated purposes tend to do a better job, and smartphones are designed to be both useful and addictive. As a result, I view the smartphone as a very dangerous tool. It can be used to great effectiveness, and it can become a blight on society.
When I was a child, I dreamed of a computer roughly the size of beeper that had no screen. Instead, I thought people would have a headset similar to Apple's wired earbuds with a microphone and we'd compute via voice with an internet connection to fetch data. Sadly, we're here 30 years later and there's still no sign of such a future. Amazon tried, Apple is trying, Google is trying, and no one is winning in that space. Apparently, it's both hard and unwanted. Today, I think my idea was naive, because such a device would likely play a minute thirty of ads before giving you the result of your query, and I would end up tossing the thing out the window of a moving car.