Bobert worries that the defence will try to prejudice the case. He is RIGHT!
Given half a chance, they WILL! Simple.
Bruce is concerned that the prosecution will try to prejudice the case to secutre a conviction. He is RIGHT!
Given half a chance, they WILL! Simple.
Bruce believes that the prosecution should hand over to the defence, anything which MIGHT be evidence. He is RIGHT!
They SHOULD!
Bobert believes that the phone cannot contain anything which would constitute evidence.
He is not in a position to make that statement, since only two of many possible saved items have been mentioned.
True that, on the face of it, those two would be irrelevant, except as pertaining to the victim's character, and even that is dubious given that replica and toy guns look frighteningly real these days.
But nobody except the prosecution knows what else is on that phone, and that is why the defence must have sight of it, if a conviction is not to be overturned on appeal.
THE JUDGE is the only person qualified to rule upon the admissibility of such evidence, since he is (supposedly) the only impartial party involved.