Been a while since I worked in the industry but each equipment cabin or cabinet should have an indentifier label giving the site reference and a central contact number for VF. This is presuming you are able to get close to the site?
In my experience most don’t, especially ones with public access. I think the operators prefer to remain anonymous to reduce vandalism from disgruntled customers. Most of the MNOs have outsourced all their infrastructure to Ericsson or Huawei so don’t manage their own sites any more.
Edit: on the rare occasion there is a label / phone number, the number is normally decades out of date and doesn’t work (I’ve tried phoning in faults / problems eg leaking lead acid batteries and just get number disconnected).