Use the % wildcard character to represent any string of zero or more characters.
select phone from authors where phone like "415%"
select au_lname from authors where au_lname like "%en%"
Trailing blanks following “%” in a like clause are truncated to a single trailing blank. For example, “%” followed by two spaces matches “X ”(one space); “X ” (two spaces); “X ” (three spaces), or any number of trailing spaces.