Lg Yahoo Friends List Doesnt Exist I Have Yahoo Messenger On My LG CU720 At&t Is That Free To Use Yahoo Messenger On My Cell?

I have yahoo messenger on my LG CU720 At&t is that free to use yahoo messenger on my cell? - lg yahoo friends list doesnt exist

u can tell me is that Yahoo messegner for free from the use of mobile phones, or will I pay each frame?
BEUC, I heard my friend T. Mobile is free to use Yahoo Messenger on your mobile phone, but I do know is AT & T is free or not
Please tell me