Contrary to some dubious claims on the internet, a private investigator cannot breach and access information, be it texts or other messages, on contemporary smartphones. A notable case in the USA saw the FBI needing a court order to compel a phone manufacturer to unlock a suspect’s device for information access. Today’s smartphones employ advanced encryption algorithms, making unauthorized access virtually unattainable without significant resources like those at GCHQ, and even then, requiring specific permissions. Given that most people rely on smartphones as their primary communication tool, it’s safe to assume that intercepting calls or messages is off the table. Any esteemed investigator would not propose such an approach in your investigation plan.