My 2011 g37 base sedan has a usb port, I would like to know who has been able to use Bluetooth in that port without having to put a 12v transmitter

 

Without adding something you'll have no way to stream music via Bluetooth unless you have navigation. There are multiple ways you can go about doing it if you search the forums. Grom or BT-SPEC are the two main ones without going to an aftermarket head unit.