Unless you have a Gnutella client on your phone, (Please do tell if there are any) then it's highly doubtful. Limewire doesn't exist yet for Pocket PCs so I don't really see how that's possible.

Limewire connects to the Gnutella network, to other Gnutella Clients.

You should ask at the store how to do this exactly, and then post it here for others if it is.