Pronunciation: [tɹˈɛfə͡ʊn] (IPA)
Correct spelling for the English word "trephone" is [tɹˈɛfə͡ʊn], [tɹˈɛfəʊn], [t_ɹ_ˈɛ_f_əʊ_n] (IPA phonetic alphabet).