> ODB

Ol' Dirty Bastard? I jest, but I think the theory behind wanting an 'On-board Diagnostics' [1] connection would be to get data from the vehicle. You can get cheap bluetooth OBD-II adapters to transmit that info to your phone, it's not a given. I don't know much about electric cars, but if you want your phone to know the fuel level in an ICE vehicle then you'd need this kind of connection.

[1] https://en.wikipedia.org/wiki/On-board_diagnostics

I make typos like that lot. The one that is most common for me is CVS instead of CSV. No, this isn't a list of things to get from the drug store ::facepalm::