A: Yes. Use a web-based proxy in Safari, or change your iPhone's DNS settings to Cloudflare (1.1.1.1) to bypass some ISP blocks.
You might be eager to paste that URL into the first unblocker Google shows you. Free URL unblockers come with significant risks. website-url-unblocker
When you type a URL into your browser, your computer sends a request to the server hosting that site. Firewalls intercept this request. If the domain is on a "blacklist," the firewall blocks the connection. A: Yes