Why did world of tanks suddenly ask for the mobile phone verification code when he logged in?

Suddenly asking the mobile phone verification code to prevent hanging up is to prevent plug-ins, but advanced plug-ins can be identified.

"Tank Blitzkrieg World" is a large-scale multiplayer tank competitive mobile game developed by Wargaming and operated by Netease.

The world of tank blitzkrieg is a free nurturing game with excellent gameplay. If civilian players want to get started quickly, they can't spend a lot of money.

It is not recommended to buy gold coin cars or lottery tickets. Gold coin cars and special cars are your choice after you are familiar with the game, avoiding waste, reducing frustration and improving the game environment. The civilian price of gold coin cars has accelerated the deterioration of the game environment step by step.