A recent New York Times opinion editorial has provided an update, reporting that a Federal Circuit Court recently decided that the cellphone evidence can be used against Carpenter, after all, despite the 2018 Supreme Court ruling, because law enforcement officers were acting in "good faith" when they obtained the cellphone evidence from the phone company. In other words, until the Supreme Court ruled, law enforcement officers had every reason to think it was just fine to ask the phone companies, as "third parties," to provide the evidence that could be used against Carpenter. Implicitly, the court ruled that the Supreme Court's decision was prospective only.
The so-called "good faith" exception to the exclusionary rule has been expanding. More and more, the courts are deciding that illegally-obtained evidence can, in fact, be used against accused persons, because the law enforcement officers didn't really know that they were obtaining evidence illegally. If law enforcement acts in "good faith," the failure to follow constitutional requirements isn't a bar to using the evidence.
Frankly, I don't find that "good faith" exception to show much "good faith" to citizens, who shouldn't be incarcerated for life (Carpenter's fate, apparently) when the evidence used to convict then has been obtained contrary to the protections provided by the Fourth Amendment.