Wifi at home also needs SMS verification. Is it safe? Has the phone bill been deducted?

You can check this with security software to see if it is safe. Tencent Mobile Manager is a good security software.

Tencent Mobile Manager is a completely free mobile phone security and management software. Although small, it has comprehensive functions.

Tencent Mobile Manager adheres to the concept of "security is self-centered and simple", and actively meets the high-end and intelligent mobile phone management needs such as user privacy protection, online management and system optimization on the basis of providing intelligent virus killing and harassment filtering in the cloud, so as to better protect your mobile phone.