You don't "need" any of those things, humans got on with life just fine without them for 100,000s of years, smartphones have only existed for the last 15.
>Maps
Look it up on a computer before you go, or ask someone on the street for directions. The only "benefit" having maps on a phone gives you is that you can completely avoid talking to people and just stare down at a screen instead.
>Music
MP3 players still exist. Or just ditch the music and be present in the moment.
>Search
I have never spontaneously needed to search something that couldn't wait 30 minutes until I was back at a computer.
>Camera
If you're going somewhere you know you're going to want to take pictures then take a proper camera. Otherwise you probably don't need one. I can't think of a single instance in the past 2 years where I needed to take a picture of something that actually mattered without knowing beforehand.