What immediate pestering? You can freely choose the apps you want to use and notifications are optional.
Your constant urge to look things up seems to be a personal problem. The device is only a tool that allows you to look things up, it doesn't enforce that behavior.
You aren't forced to use Google Maps for every trip. Of course you can plan the route and memorize it in advance. Or drive in the general direction and follow the street signs. But it is great to have a navigational device with you as a safety net in case you get lost... in the past you had a few maps with you or had to annoy other people asking for directions.
And why do you lose concentration by carrying a smartphone?
It's easy to see the smartphone as just a tool, but many people (myself included) of course used it's many capabilities. A smartphone invites to be more connected and having the internet at your fingertips at all times isn't good for your study habbits.
For me, simply not having it is the best motivator for losing some bad habbits. And as a phone, a feature phone will always be a vastly superior choice to a smartphone.