Why do I need to set a security phone number or email address?

Applicable products： PC，Tablet，Smartphone
Applicable system: EMUI 3.0, EMUI 3.1, EMUI 4.0, EMUI 8.0, EMUI 4.1, EMUI 5.0, EMUI 8.1, EMUI 5.1, EMUI 9.0, Android 8.1.0, EMUI 8.2
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Why do I need to set a security phone number or email address?

A security phone number or email address can be used to reset the password and verify the identity.

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