I travel, a lot. And rent a lot of cars. More than once, by the time I get to my rental car my phone is near-dead and a charger isn't always handy. Then you'd

I travel, a lot. And rent a lot of cars. More than once, by the time I get to my rental car my phone is near-dead and a charger isn't always handy. Then you'd have the issue of pairing your phone with the car, which for some cars isn't always obvious. People who don't travel a lot often have phone plans with crappy coverage in random areas. In short, if you want to ensure a reliable way for someone to contact a customer support person from the rental car company, relying on the users cellphone and hands-free setup is NOT the optimal case.