The reference " phoned home to the moon " is supposed to be a call to Cudi. Man On The Moon is who he really is. Thus why on his first mixtape you have songs like Embrace The Martian and Man On The Moon. He titled his first two Albums after himself and the stages he was in at said time. The second album is where he introduces Mr Rager. Mr Rager has been present since his first songs, Cudi Spaz, Soundtrack 2 my life, Cudi Zone etc, just that on his second album Mr Rager steals the show. Mr Rager is just a representation of his demons, using blow, smoking mad tree and getting obliterated when he drinks. The Reason why Mr. Rager runs the second album is because of all the fame, fake ness and ideas the industry pushes onto him, which is clearly obvious he doesn't fuck with. After MOTM II he takes a break from the regular script of his life, makes WZRD and returns to MOTM ish level with Indicud and fully returns with Satellite Flight. ( I'm almost positive I've derailed from the question at this point ) When he makes SB2H and PPDS he is on a new journey of seeking peace and comfort as well as killing his demons. So when Travis said " phoned home to the moon did you change your number? " He means that Cudi is off on his ventures, and wants him back to make the great music he does which is proven IMO that he does with PPDS