iPhone supports tethering over bluetooth, no need to carry a usb cable. While bluetooth doesn't allow multiple clients as wifi does, it's more energy conservati

iPhone supports tethering over bluetooth, no need to carry a usb cable. While bluetooth doesn't allow multiple clients as wifi does, it's more energy conservative (being a PAN, not LAN). (I had Novatel MiFi, and it run out of battery in ~6 hours if you forgot to switch it off (happened regularly to me). Bluetooth connection automatically terminates when you eg. close your Macbook.)