My girlfriend and I do a good bit of VNC screen sharing on our Macs while working. We like to go work in coffee shops, but sometimes we don't have the best of internet connections. We currently have a 12gb data plan with Verizon with tether enabled. I'm wondering, if we're both connected to my tether and using VNC over the local network, it shouldn't consume any of my data, correct? Is there any way that this could consume any data? Local networking is generally never seen by an ISP, but I'm not sure if cell phone tethers work in a different way or send data to the carrier about usage that could cause slow theoretical data drain. Can anybody verify that local VNC over a cell phone tether will not drain data?