>>1487363>do you know anything I can try?If your phone provider or ISP has its own "approved list of safe sites" to use, then you can change the DNS provider to no longer use the phone company's DNS.
Look up any online website that answers your question "how do I change my mobile phone's DNS?" Typically, to do this, you go to your phone's SETTINGS. Locate the "Network Settings" and the sections for WiFi or cellular data. Look for the DNS Options in those categories. Popular public DNS providers include:
Google Public DNS: 8.8.8.8 and 8.8.4.4
Cloudflare DNS: 1.1.1.1 and 1.0.0.1
OpenDNS: 208.67.222.222 and 208.67.220.220
Since you have not mentioned your phone model, only the generic information is provided above.