Telephone Disconnection

[Joey94LS400]

hello all, my name is joey, and i am the new owner of a 94 ls 400. i am currently having radio trouble, and i was told that the telephone could be why the radio doesn't put out any sound. I was wondering if someone could tell me how to disconnect all things associated with the previously installed telephone. your help is greatly appreciated considering that this issue is racking my mind. i have also: tried replacing the amp located in the trunk/driver side, and that didn't work. i was unable to access the amp located under the cd changer, in fear of breaking the carpet shell. if the following could be a problem as well please let me know.

Thank you very much,

Joey