DNS Encryption Warning

I have never seen any warning like that.  I have seen some browsers say the connection isn't safe because the site address was typed with http instead of https.  Most websites only need https when you are making a transaction or accessing secure information, like your online banking.

I haven’t seen that before personally but that doesn’t necessarily mean it’s referring to T-Mobile.  When you access a website, you are accessing a network that hosts that site.  That would be my guess what it is referring to because I have not ever seen that message when logging into my online banking or to T-Mobile’s website from my phone to pay a bill.  Have you tried using a different browser to see if it might be related to your current browser?

I have never found this to be an issue when using either a private DNS service or simply Cloudflare. In your WiFi router settings, change the primary DNS to 1.1.1.1 and secondary to 1.0.0.1 - or, continue to use your current DNS “ automatic “ and install an app called iVerify and in settings, change DNS/DOH to “Cloudflare”. That app forces all traffic to HTTPS and enforces DOH by default. Pretty cool and fixes that because CF always supports DOH.

I used quad 9 until last week, when for some reason they stopped accepting DoH from IVerify. No kidding, changed providers and the warning immediately went away.