Phone numbers called. Phone numbers received. Pictures on the phone. Locations of calls placed and recieved. Times and locations.
There is also physical evidence associated with the phone itself. Prints. DNA. Hairs and fibers. Blood, if present.
Technology makes up a big part of the American police state.
It’s only going to get worse in the future. If you can, give up or ration technology NOW, before getting hooked on it.