The scenic loop dispersed camping was great a couple of weeks ago. Quite a few spots even though Mammoth was open for snow. However, my partner and I drove around the whole loop looking for internet and couldn't get anything better than a couple Mbps with both T- Mobile and Verizon, even with our MiFi.

Amazing space to get dispersed camping. We drove in an adventure van with AWD and had no issues accessing the campgrounds. For internet access, the best we could get was always sub 10 mbps, so perhaps not the best spot for video conference meetings.