It's in Goodell's ruling.
It states that at the appeal hearing the NFLPA and Brady handed over a list of phone numbers that were said to be relevant but were from the phone that Brady had before the one he destroyed, which I believe he still has. According to the NFL he didn't hand over anything from the destroyed phone because as he admits, he couldn't get it.
Edit: And as Brady arrogantly says, "the NFL had ALL relevant communication.." anyways, so why should he hand it over?