This is an important decision about government use of cell phone tracking information. I have not gone through the decision in detail. I am inclined to side with the liberal majority in this case.
My opinion now is that the government should not be able to track a citizens movements with exquisite precision (or any precision for that matter) without a warrant.
Having said that, I have not reviewed the four dissents from the four conservative members of the court. Experience suggests that upon review of the conservative dissents there is a better than 50% chance that I change my mind and side with the conservatives.
Orin Kerr provides a question and answer post about the decision that is informative. Click on the link.