Fill in what you know and leave the rest. It saves on this device as you type, so you can put it down and come back. The flagged sections are the ones the phone carriers need before any of your numbers can send, so those are worth doing first.
We filled in what we already had from your calls and your file. Those are tinted, with a note underneath saying where each came from. Please read them rather than scroll past. Carriers reject a registration over one wrong character, and that costs weeks.