That is exactly what happened. I was wondering why they wanted his phone. The phone company has all the metadata. Very clever. Kudos to CPD.
Johnny: [after hearing the sirens] It's the phone cops. They know what I did here today.
Venus: What are you talking about?
Johnny: They're coming to get me, man!
Venus: That's paranoia, man!
Johnny: Wake up, sucker, this is the phone company we're talking about! They see everything, they know everything, they got their own covert police force! I'm probably wired for sound right now! I gotta get out of here!
Venus: Johnny!
Johnny: Don't use my name!!