It isn't wire-tapping if they block you from accessing the wire to begin with. Forcing the phone companies to carry your speech over their wires is compelling speech across their property which should be against their 1A rights if you're correct. However, it clearly has been ruled not to violate their rights.

Yes it is.

I mean, there's a law against it. But there is a lot of known warrent-less wire-tapping, both by govt and industry, and everyone shrugs.

And it's not even a de jure vs de facto thing, since by now a lot of the ostensibly illegal stuff has been either defended successfully in courts or buttressed by the govt.