Answer: MNO

AnswerCrossword Clue
MNOLetters below DEF
MNO6, on a phone
MNOLP connection
MNOP preceders
MNOLP insert?
MNOLP link
MNOLetters next to a 6
MNO6 on a cell phone
MNOL-P series
MNOLP connector
MNO6 on a handset
MNOLP attachment
MNOTrio on a phone keypad
MNO6, on a cellphone button
MNOLetters above WXYZ
MNOPhone button letters
MNOPhone button sequence
MNOL-P filler
MNOL-P linkup
MNOL-P hole?
MNOQueue before P
MNO6, on the phone
MNOTouch-tone 6
MNO6?
MNOKeypad trio
MNOL-P connectors
MNOAlphabetic trio
MNOTelephonic 6
MNOPhone's 6
MNOL-P link
MNOLP center?
MNO6 on the pad
MNOCaller's 6
MNOTelephonic trio
MNOL-P connection
MNOLP filler?
MNOLetters over a 6, maybe
MNOPhone button trio
MNO6, on a telephone
MNOTelephone trio