Make sure Share iPhone Analytics is toggled on.
Tap the "Analytics Data" option.
Scroll down until you reach the last file that begins with log-aggregated.
Drag the cursor down to the bottom and hold your finger there, it will eventually scroll very quickly.
Open the built-in Notes app and paste the contents of that file into it.
Click the action icon in the top right and then select Find in Note.
Sometimes, when you are busy or out and about and your iPhone starts ringing, you don't want to pick it up, but you know it might be so-and-so with that important call you've been waiting on.