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I was happy to set up 1.1.1.1 for my daughter on her Iphone7 but it never seemed to work well with Mobile Data (Freedom Mobile Canada). Internet would always be spotty/non-existent. The app being used was Google Classroom. In the end we turned off 1.1.1.1 and Google Classroom started working. Anyone experience anything similar?

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Did you set up both 1.1.1.3/1.0.0.3 and also 2606:4700:4700::1113/2606:4700:4700::1003? Maybe there was some IPv6 issues.

https://developers.cloudflare.com/1.1.1.1/1.1.1.1-for-famili...

this is definitely the solution, mobile is mostly ipv6 in my experience

One thing I can think of is: perhaps some sections (all?) of their network is IPv6 only, and the carrier does XLAT64. In which case they would provide custom dns servers which resolve IPv4 dns records to IPv6 addresses. Custom DNS servers would not do that, therefore IPv4-only services would not work.

May well have been something else though.

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