This paper compares Harold Garfinkel's phenomenologically informed "radical" ethnomethodology and Emanuel Schegloff's "classical" Conversation Analysis, by focusing on their treatments of a ringing telephone as a summons. In their diverging accounts, Garfinkel and Schegloff use similar yet different terminologies in relation to the action of hearing. Garfinkel speaks of the "hearability" of the ringing phone, while Schegloff speaks of a recipient's "hearership". This lexical distinction is not irrelevant. "Hearership" stresses the obligations of parties to a phone call to speak and listen to each other while co-producing conversation. In contrast, for Garfinkel an analysis limited only to the parties' work of speaking and listening to each other from within the hearable world glosses over the pervasive presence of the "hearability-structures' of the ordinary world. His "radical" version is predicated on the claim that the ordinary world is a hearable world. Accordingly, a phone summons is a familiar sound in which "hearability" is inseparable from the "hearability-structures' endogenous to the Lebenswelt.