Cellphone rhymes with:
aiton, aon, bastone, briggstone, brimstone, cerbone, citroen, gambone, glendon, halcyone, hendon, keown, ketone, lactone, marylebone, milhoan, moton, okon, pharaon, pistone, provolone, rendon, shadoan, shimon, shimone, smothermon, tabone
Cellphone sounds like:
califano, calvani, calvano, calvin, calvina, calvino, cellophane, chalfin, clapham, clapman, clavin, clephane, cleven, colvin, cyclopean