1) Abbreviation before a number 2) Abbreviation in an ad 3) Address book datum 4) Address book entry 5) Address book no 6) Address-book info 7) Ancient mound 8) Arab word for hill 9) Arabic word for hill 10) AT&T pt 11) Aviv antecedent 12) Aviv header 13) Aviv lead-in 14) Aviv leader 15) Aviv opener Found on https://www.crosswordclues.com/clue/tel