An old hack that not many knew was that you could tap the hang up switch to dial numbers. Example, tap 3 times = 3, tap 10 times = 0.
Rotary phones did the same thing which is why you had to wait for the whole thing to spin back, it was tapping the line to dial out.
bjoern_tantau@swg-empire.de 11 months ago
Trainer at my Judo club used that to call my parents with the gym-phone that had its disc locked with a padlock, when I got injured. He was great.