I'm not sure I understand what you mean when you divide telephone companies and ISP's. All ISP's (that I am aware of) are telephone companies and cable companies. I am 90% positive that the moment a cable company supplies internet or telephone services they are bound by all laws the telephone companies are bound by. But I am going to look into that to make sure.
No they are not. It actually was a Supreme Court case, though. Nat'l Cable & Telecomm. Ass'n v. Brand X Internet Servs.
, 545 U.S. 967 (2005).
So what you are saying is, you have no proof that any current obscenity law in the US is being enforced in regards to the internet?
If so, that's what I just said.
No. I said the law currently exists to prevent obscenity on the internet (at least for sale) and that the official Republican Party Platform says that these laws should be enforced. In fact, obscenity prosecutions took place in 2005 with the Obscenity Prosecution Task Force
. You claimed that the government could only prevent obscenity if they own the internet services but can't do it now, which is wrong.