My basic mobile phone-and wifi!
Lol...Best money I've ever spent.
When I had my '07 BMW M3 , expensive to own and maintain yes, fun to drive and own? yes yes! One of my favourite cars and all. Can daily it and can track day it too. Though shame I have to drive it in Pennsylvanian traffic, which is notoriously slow on Route 22. It's not the condition of the roads that people hate, it's the stench of Lehigh valley traffic..
My phone. My mom made me get one.