Sorry but No. The phone line has DC to power the old-style carbon microphone and AC to ring the bell. If you try to draw appreciable current, the system thinks

Sorry but No. The phone line has DC to power the old-style carbon microphone and AC to ring the bell. If you try to draw appreciable current, the system thinks your phone is "off hook", so the phone is out of service. You can draw a tiny current without triggering the "off hook" detector, but that is miniscule.