Vintage SOS Portable Phone w/ car power plug, case, instr bk, like new

Vintage S.O.S. Phone (was called a brick phone for a reason!) with car power plug (also runs on 5 AA batteries). Includes instruction manual in like new condition. By SOS Wireless Communications in California. Flip phone comes in heavy-duty black nylon zip case with belt hook. Phone is 6 5/8 x 2 3/8 closed. Case is 8 x 3. Not sure if this would still be useable--if you could get service for it or not. $10