This paper assays phone interactions in Yiddish that are broadcast by telephone to ultra-Orthodox Jewish communities via off-hook services called “hotlines”. Yiddish, a minority language, is the native tongue of most hotline speakers and features their communal affiliation within the ultra-Orthodox world. The paper examines the instrumentalities of one Yiddish hotline in order to discover features that ease its role as a membering medium for its community. It is displayed how participants employ this medium to index who is – and who is not – a community member via language decisions that reflect language ideologies and uphold community boundaries; interviewees index their membership by linguistically accommodating interviewers; and hosts, on occasion, change language to ostracize an interviewee. The paper also examine the problematic status of Modern Hebrew for this community.