I have a BB pearl 8100, unlocked to T-Mobile. I recently installed Ramble into my phone and I'm afraid changing any of the TPC information will screw me over since the information involve "cingular" coding. Will it mess it up? Also, I heard a few things about Ramble having some sort of billing. I have unlimited text so I don't think it's an issue, but just in case is there really any extra fee's into it?