It is not the FR that is restricted, it is MY access to the FR that has been selectively restricted. It’s coming for you too.
What happens when you type a website name into your browser is that the DNS server returns an IP address for that name. Then your internet provider routes the request to the host with that address. They can't block access by route. But they can block names if you use their DNS.
But in case you want to try it without doing any work, just wait until freerepublic is "blocked". Then type https://209.157.64.200/tag/*/index into your browser. If that works then AT&T is blocking via DNS and you can easily bypass that.