Google, youtube, twitter and FB are joined to stifle conservative speech. They have billions of views and subscribers. They systematically block opponents of democrats who are running against them in the election and rational gentlemen like Dennis Prager. They have the ability to effect the outcome of national elections by stifling political speech.
When FR reaches a billion subscribers and can significantly effect the election by stifling liberal speech, then it may be regulated.
When your e-mail and phone call contest are blocked you might take a second look.
There's absolutely nothing stopping my email provider (or yours) from blocking, editing or deleting my emails other than the terms of service we both agreed to when I started using the service.
Now, just like with the social media companies, the real governor is business. They wouldn't have many email customers if they behaved that way.
Also, don't be so sure your cell phone provider can't do the same thing - they aren't regulated the way AT&T was.