How Can I Download Yahoo Messenger To My Mobile?

1. I Want to Be Down load Yahoo Messenger to my pone, I can download any type of mobile phone, or if there are any special phones phones, I'm not using cards to pay a bill for the phone each month. u can tell me how can I load myself it is a process? Or where I can go and get more information? If I get a phone without Coloure screen, I can invite me? Did I buy a phone with Bluetooth? My intention with downloading it so that I am with yahoo mail beta, I can d0 that, Please help me to send. cuz I'm going tomorrow to buy a cell phone. Thanks