I think this question has probably been answered here, but I just wanted to make sure.

I have unlimited data plan with enterprise email from T-Mobile on my Pearl. I downloaded RIM yahoo messenger from the blackberry site. Now from reading this thread, I understand that I use the RIM yahoo messenger ( not the OZ one ), then I will be using my data plan to send and recieve messages and not the SMS text ( I dont have text plan and each text is charged at 15 cents ).

Am I correct ? I dont want to pay for text messages.

Thanks for your replies