Once you know which layer is doing the blocking, the right fix is obvious — and so is the reason the wrong fix did nothing.
It is the address that gets blocked, not the site
Blocking is applied to individual domain names. That is why one address stops loading while another belonging to the same site opens instantly, and why a site can be perfectly healthy for most of the world and unreachable from one network.
The layers, easiest to hardest
DNS-level — the common one
Your provider’s DNS refuses to answer for that name. Symptom: an instant “can’t be reached”. Fix: change your DNS. Minutes, free, no speed cost.
SNI or IP-level — less common
The name resolves, then the connection is dropped as it is made. Symptom: a long hang, then a timeout. A DNS change will not help. Fix: a different official address.
Transparent proxy
You get a notice page instead of the site. Fix: a different official address, or a VPN if you need that specific one.
Why it often follows you to mobile data
Directives usually go to every operator at once, so the same address can be blocked on your broadband and your SIM within days of each other. That is not a sign that your device is infected or that you are on a fake site — it is the same instruction reaching two networks.
Why several addresses exist
Because one address is a single point of failure. Running several is what keeps a site reachable when one gets blocked — it is ordinary practice, not a sign of anything suspicious. It does mean you should check an address against the official list rather than trusting whatever a search result offers, since look-alike sites rely on exactly this habit of hunting for a new link.
What actually helps, ranked
A different official address — instant, nothing to configure.
A DNS change — one minute, fixes the most common layer, no speed cost.
The other network — Wi-Fi vs mobile data.
A VPN — works at every layer, but it is slower and it is the last resort, not the first.