I used to get unsolicited calls on my home telephone line. These days I am also getting such calls on my mobile phone. These calls are a nuisance and should be responded to with vengeance.
Here is an idea. Calling all app developers: make an app that is able to deal with unsolicited calls in the most punitive way. What would you do with the call once your phone recognizes it as an unsolicited call?
1. Accept, don't block, the call. Then let it listen indefinitely to an endless music stream.
2. Respond with a different answering machine message, reserved for this purpose. Prepare a message that will give the caller an earful.
3. Prepare a list of seemingly valid options to waste the caller's time. For example, "Dial 1 if you are a family member, dial 2 if you are a friend..... etc. Then if 1 is chosen, "Dial one if you are an ex-wife, dial 2 if...."
4. Any other ideas?