In most phone-evidence cases the prosecution's examiner worked the device on an enterprise platform and produced a report of the findings that matter to the prosecution's theory. The defense receives that report and, if discovery goes well, the underlying extraction or backup beside it. The structural problem is that the report is a set of choices, which artifacts were run, which filters applied, which threads exported. The defense cannot evaluate those choices from the report itself.
Independent review means opening the underlying evidence and reading it with defense questions in mind. That has traditionally required either retaining a lab for every first look or licensing the same enterprise platforms the state uses, both at costs that appointed and private defense budgets absorb badly. Sherlock Forensics iPhone Analyzer removes the tooling barrier: the produced extraction or backup opens on a defense workstation at $599 one-time, with a free edition that makes the first look cost nothing at all.
If the immediate question is simply how to open a production you just received, the step-by-step is on the received-in-discovery page. This page is about what a defense practice does with that access.