Yes, TELEPHONES is a Scrabble word!

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

Is it a valid word?

TELEPHONES 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
transmitting speech at a distance

Also: telephone set, call up.