If this has been asked and answered before I apologize.

Do instant messenger programs use your data plan or does it count as text messages?

I have an 8525 with an unlimited data plan. I know I can use things like Yahoo and Google Talk but I am not sure how they work. If it counts as Data then I have nothing to worry about, if using them count towards text messages then I could see my self going over my text messages and getting billed extra.

Thanks in advance.