It looks like Verizon has exclusive rights to stream the AFC / NFC championships and Super Bowl on mobile cellular devices. I tried tethering a MBP to my old iPhone to watch the games on Sunday (by swapping SIM cards), and got "not authorized" popups. Otherwise tethering works fine. My guess is that the Verizon has a specific range of IP addresses it uses, and non-Verizon IP addresses are blocked. If this is the case, is there any way to spoof a jailbroken iPhone's cellular data IP address? Or does anyone know of another workaround?