Crossword Clue:

SUBCELL a subdivision of a cell

Answer	Crossword Clue
NUCLEATE	Having a center, as a cell
ROAMED	Used a cell phone, in a way
NULL	Without a value, as a database cell

SHH	Admonition to a cell phone user in a theater
NONO	Talking on a cell phone during a movie, e.g.
ROAMS	Runs up a big cell phone bill, in a way