Yes, PHONES is a Scrabble word!

Letter values in Scrabble US: P 3, H 4, O 1, N 1, E 1, S 1.

Is it a valid word?

PHONES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds
(phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language
electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear

Also: telephone set, speech sound, call up.