I'm trying to confirm that using AIM/Yahoo/etc messenger services actually deduct from SMS. It's not that I don't believe it, I guess. I know tmo has told me that's the case.... I just haven't used them on my BlackBerry because I didn't find it convenient. So, I just tried it...I used AIM. I can't remember where I originally downloaded the client but it has T-mobile branding on it so I assume it's some officially sanctioned client. I sent one IM and received two and it did not seem to count against my SMS pile of 700 messages. I had 7 used before and I have 7 used after. So...what gives?