Some sites do not open via Wi-Fi from the phone, how to solve?

Question

WiFi

Hello. I reconnected the provider, noticed a strange thing: some sites stopped opening from the phone (local news, some random others, ali, wilberry, some online games). Moreover, from the computer they open normally and when the Wi-Fi is turned off, too. In technical support, the maximum was advised to turn off the router for 10 minutes, but this did not help. Everything worked fine with the previous provider. In which direction to dig?