Would love some help identifying a single slot touch tone pay phone

[rglenn]

I'm hoping to figure out the make/model so I can find keys to remove the upper housing and get it working as a home extension.

[Key2871]

Protel or Elcotel is my best guess, as to the model, you may have to open it to verify.
But I'm sure theres others here who will know right off.

[tallrick]

Just drill a small hole above the lock and punch out the arm. It is a GTE quadrum housing and can have any kind of locks, Medeco, Abloy, etc. You will never find keys for it.

[rcourtney]

Looks like Abloy.  Yes, drill center hole.