He could have kept the secret by saying, "the 4 is 30%, 100%, 1000% worse than the GS", but then the people would not know that that translated in less than 1% more dropped calls. "1000% worse" would lead people to think that it totally sucks (and an engineer would think this is the correct interpretation, in any case).
Haha that's true, I guess I'm also looking at it from an engineering perspective, where 100% increase seems really bad regardless of how small the base number is.