Quote Originally Posted by ~SapphireStar~
Ive never seen it, but from the sounds of it its something Square have thrown in. Squall and Rinoa talk about meeting again in the opening movie and perhaps this was placed there as a secret message that they will always be reunited.
Uh, well, I searched for the phrase on Google to see if there was any other info, and according to the sites I landed on there are three phrases looping:

"I'm alive"
"Bring me back there"
"I will never let you forget about me"

Also, according to those sites, the messages are sent from Adel in space, disrupting the radio waves (which would be possible from what the game tells us). It makes sense to me.