Got rid of the house phone about 2 years ago and just use my cell. Haven’t had a solicitor since.
I did the same but made the mistake of keeping same number on my new cell. It wasn't until I decided to get my number changed that the calls stopped.
As a side note, I tracked down a telemarketer's number on the internet to a site where many folks were complaining about the calls. Someone there had managed to track the bogus company to some guy in florida who's been responsible for a number of scams and they even listed his current company, the phone number and his home address........LOL!