I was in phase 2, but I never got an email in regards to phase 3, however, this morning I opened up my launcher to update the game on a whim, I entered my credentials and sure enough it updated. Then it gave me an option to play. I created on my character, on Ultros, and got in no problem. So, even if you didn't get a phase 3 code but were in an earlier phase give it a go and see what happens.
Game looks amazing! Hoping to hook up with the ZAM LS later tonight.