Yes, I’m equally concerned about that.
If he used his phone to call an accomplice, why would the police have ever checked it? Wouldn’t they need a warrant for that?
Because “Taxi driver and accomplice burgle homes of travelers” is a headline that goes back to the 1800s and the police know that this was a common thing. They would ask nicely then get a warrant if they had to (translation: Driver said no.).
Also, in certain cases, the driver for Uber or Lyft already agreed to surrender call and text histories to the company or to law enforcement in the event of an accident or criminal investigation related to the company. So no warrant may be required.