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1.1.1.1 DNS Service
I like using the Cloudflare's new public DNS resolver 1.1.1.1 because it makes DNS queries faster and more secure, but when my MacBook Pro (macOS Sierra 10.12.6) DNS settings are set to 1.1.1.1 ...
Hey, @magentapink!
Welcome to our Support Community! Does your hotspot work when you don't attempt to modify the DNS settings (when not using Cloudfare's new DNS resolver)? If so, the service is working as it should be and we don't have any other workarounds to provide a different DNS setting.
see here, it does seem they are blocking them and if you want to use an alternative dns provider use secure dns
https://community.t-mobile.com/tv-home-internet-7/dns-blocking-on-t-mobile-gateway-gateway-refuses-to-accept-connection-35146?postid=128609#post128609
