Poland · open in early access
Is my site blocked on T-Mobile in Poland?
T-Mobile Polska blocks the domains in the Finance Ministry's gambling register and, as one of the four providers in CERT Polska's 2020 agreement, domains on CERT Polska's phishing warning list. Business customers can also buy Ochrona w Sieci ("protection on the network"), a filter inside T-Mobile's mobile network that blocks by server address, by DNS and by web address. If only some T-Mobile mobile users see a warning on your site, check whether they are on a business plan with that filter.
Sources: CERT Polska, updated 2 September 2026 · Ministry of Finance, 28 March 2018 · T-Mobile Polska, Ochrona w Sieci terms, in force from 21 September 2023
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We open it through home connections of Orange, T-Mobile, Play and Netia and mobile connections of Play and Plus, the way their customers would, and tell you provider by provider whether it opens. Free, about a minute, a few checks per hour.
What is T-Mobile's Ochrona w Sieci?
It is a paid, opt-in security filter for T-Mobile's business plans, Magenta Biznes (including Magenta Biznes Internet) and Jump Profirma. It is switched on one phone number at a time and costs 5 złoty a month before VAT. It watches only traffic between T-Mobile's network and a device with a T-Mobile SIM card, so it covers data sent over T-Mobile's network from such a device. The terms offer it to business customers only, and it must be ordered; it is not on by default.
Sources: T-Mobile Polska, Ochrona w Sieci terms, in force from 21 September 2023, sections 1, 3, 4 and 5 · T-Mobile Polska, Ochrona w Sieci for business, checked 11 November 2026
How does Ochrona w Sieci decide to block a site?
It runs on next-generation firewalls that use threat databases from the firewall maker plus rules written by T-Mobile's own security teams (its CERT and its security operations centre). Those rules list server addresses, domain names, web addresses and traffic patterns. Among other things, the filter blocks connections to server addresses rated as malicious websites, phishing, spam or botnet control servers; DNS lookups (the step that turns a domain name into a server address); plain web requests; and, when the phone uses encrypted DNS, the site name a browser sends at the start of an encrypted connection. So the filter can stop a site even when the phone does not ask T-Mobile's DNS.
Source: T-Mobile Polska, Ochrona w Sieci terms, in force from 21 September 2023, section 3 and table 1
What does a T-Mobile customer see when the filter blocks you?
Often a warning page in the browser, but not always. T-Mobile's terms say the warning is shown when a threat is blocked, and that because of different browsers, settings and blocking methods it will not appear in every case. A web agency, Creativegen, described in February 2025 a client site that T-Mobile users with Ochrona w Sieci could not open. They saw "Uwaga! Ta strona stanowi zagrożenie!" ("Warning! This site is a threat!"). The site was not on CERT Polska's list. According to the agency, T-Mobile unblocked it within 24 hours of a report and said the site had been flagged because it was new.
Sources: T-Mobile Polska, Ochrona w Sieci terms, section 3 · Creativegen, 27 February 2025
Who can lift a wrong block on T-Mobile?
That depends on who put your domain on a list. For CERT Polska's list, the formal route is an objection to UKE, Poland's telecom regulator; for the gambling register, an objection to the Minister of Finance. Both are explained on the Poland page, and T-Mobile's support cannot replace them. For Ochrona w Sieci, T-Mobile publishes no route for site owners. In the Creativegen case the report went through the chat on T-Mobile's website, opened as a T-Mobile subscriber, and became a technical ticket. A business customer who has the filter can also file a complaint under the terms: in writing, by phone or electronically. T-Mobile aims to answer within 30 days, and a complaint not dealt with in 30 days counts as accepted.
Sources: Creativegen, 27 February 2025 · T-Mobile Polska, Ochrona w Sieci terms, section 9
How can I find out whether T-Mobile is the problem?
First search your domain in CERT Polska's list and the gambling register (both linked from the Poland page). If it is in neither and the person reporting the problem is on a T-Mobile business plan, ask whether Ochrona w Sieci is on for their number. The company that pays for the filter can see every blocked event in reports in the Mój T-Mobile app or at nowymoj.t-mobile.pl, which can confirm whether the filter caused it.
Source: T-Mobile Polska, Ochrona w Sieci terms, section 3 and table 1
What does linkspect check on T-Mobile?
We open your URL through the home broadband connections of T-Mobile customers in Poland. T-Mobile mobile can be included in a check: we measure it when we have a suitable test connection at the time, and otherwise that answer says "not measured". Ochrona w Sieci is not part of what we measure. Other Polish providers: Orange and Netia.
Facts checked on 11 November 2026.