DNS Encryption Warning

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. 

DallR1 wrote:

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.

Personally, I use Quad9 and have never had an issue either.  Perhaps the provider or app the OP is using just doesn't have their configuration right or has some sort of issue.  

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.

The message is displayed under the iPhone’s WIFI settings so I’m assuming it is referring to the T-Mobile network.

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?

Here is a screenshot. I really want to know if it is a setting that can be changed, or it has something to do with T-Mobile collecting meta data.

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.