Apple’s two-factor authentication system deflects access to your Apple ID account by requiring that in addition to your password you also have to provide a code that arrives either through a trusted device (an iPhone, iPad, or Mac) or a trusted phone number—one that’s been verified after having been added. Trusted devices are an easier set to manage, because they represent all devices logged into the same Apple ID for use with iCloud. Trusted numbers are a different matter.
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