The US model uses the Verizon network. I've heard that their phones don't have a removable SIM card so it wouldn't surprise me if the car doesn't use on either. I don't know where I read it but someone changed their cellular modem out, it might have been on the older Nissan LEAF, however, since the US version used the AT&T 2G network which was shut down a year or two ago.
David D. Nelson
Blue 2016 Soul EV+ & Cloud 2018 Soul EV+