There was an interesting discussion about 4A implications between Orin Kerr (who thinks, that according to 3rd party doctrine, there was no need for a warrant, and therefore no 4A protections of cell-cite data) and Alex Abdo (of ACLU, who argues that, since the collection was too excessive, it does trigger 4A protections).
Link: https://www.youtube.com/watch?v=hW32k7x7zE0