Yes, MOBILES is a Scrabble word!

Letter values in Scrabble US: M 3, O 1, B 3, I 1, L 1, E 1, S 1.

Is it a valid word?

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

a river in southwestern Alabama; flows into Mobile Bay
a port in southwestern Alabama on Mobile Bay
sculpture suspended in midair whose delicately balanced parts can be set in motion by air currents

Also: mobile river.