Does the government's use of a pretrial subpoena to obtain a defendant's historical cell-site location information (CSLI) from a wireless carrier violate Carpenter v. United States?

QUESTION PRESENTED FOR REVIEW If the government issued pretrial a subpoena to a defendant’s cell phone provider for historical cell-site location information (CSLI) in order to find a crime scene and, as a result of the subpoena, the government was able to discover the list , of phone calls by the defendant, the CSLI for the defendant, and the locations of the cell towers, does this government action violate Carpenter _v. United States, __US.__, 138 S.Ct. 2206, 201 L.Ed.2d 507 (2018) (the government must use a warrant, in the absence of an exception such as exigent circumstances, to obtain CSLI from wireless carriers)?