When you are on parole you basically have the same rights as you had in prison.
The police can search your home or office without a warrant. Why would the phone be different.
If the offender is a pedophile you would want to check his phone for child porn just as you would check drug addict’s home for heroine.
On parole, your rights are severely limited. The person agreed to this as a condition of parole.
He gave permission for the police to search his phone in order to get parole.
Good point. So I take it this is a red herring?
Either way I will never willingly give access to anything of mine without a warrant.