I think a novel defense could be never admitting the phone is 'yours' in the first place. Divulging the password is tantamount to admitting you have access to

I think a novel defense could be never admitting the phone is 'yours' in the first place. Divulging the password is tantamount to admitting you have access to the particular device in question. You might argue, well the police will have ways to prove it's your phone. Okay, so let them prove it, don't assist them. Well, then they can force you to produce your password, whether you admit it's your phone or not. But by divulging a password, you're admitting you own a phone somewhere, and part of your defense might be (however implausible) that you don't own/use a phone.