https://www.donotcall.gov/

https://consumercomplaints.fcc.gov/hc/en-us/articles/202873880-Robocalls

https://www.fcc.gov/guides/truth-about-wireless-phones-and-national-do-not-call-list

https://www.fas.org/sgp/crs/misc/R43684.pdf

https://www.puc.texas.gov/consumer/phone/Nocall.aspx

https://www.texasattorneygeneral.gov/cpd/telemarketers-junk-mail

https://www.texasattorneygeneral.gov/cpd/telephones-faxes

http://www.realtor.org/field-guides/field-guide-to-do-not-call-and-do-not-fax-laws

Other states besides Texas might also have their own do not call list(s).

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Cellular telephones should have their signal (calls) come thru the Internet and people should be able to manage them same as we do with emails, that is we should be able to block spam calls and particular senders and even senders' domains and or only receive those calls from people on our address book, block and or allow calls from particular places , like allow only local or allow only Texas and or block New York city and block Arizona state, Etc (whatever).

We seem to  have more control with emails than we do with telephone calls.

If telephone calls were digital and our telephones were a sort of mini-computers and were controlled with C.P.U.s then maybe the telephone calls would not have to come thru the Internet they would come as they do now, but their signal would be digital.

Well, whatever!

People can already get telephone calls thru the Internet, but I have never tried that so I don't know how it works.