Ok, so I know a bit about the mobile networks at VP.
Voda have a basic system installed in the stands, should allow a lot of users to browse data during peak times, don't expect lightning fast speeds though.
EE & 3 currently using a small streetworks type pole on Witton Lane. Only suitable for a few hundred users max. Its completely swamped on match day and provides a terrible customer experience. Internet browsing virtually impossible at half time. BUT....EE are currently putting a 4/5G system into the stands with a couple of gigabit connections, huge antennas in 2 corners of the stadium, once up and running should provide excellent coverage and data speeds for EE customers and any network that piggybacks EE's network.