China Telecom reminds you that the router has been hijacked by hackers.

Absolutely. Hackers first rub your network, and you are in the same local area network, and then modify dns. When you are in Taobao, he will know your password and payment password! You have to change the wifi password first (it is best to turn off the hotspot first), and then change the router login password, because hackers can know your router login password with the wifi password, and vice versa.