Yahoo Messenger Work-around "Service Not Enabled"

I installed Yahoo Messenger yet I get the "service not enabled for this handheld" error message. I have the Curve 8310 on AT&T.

I read something about installing service books or something like that but I have no idea what any of that is and don't want to goof up the phone. Also I don't have a BIS my data plan is generic.

Is there any workaround for this--another program that could access the same Yahoo! ID, maybe?

LRH,

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