What is a trusted device?
You can designate a PC or other device (like a Windows Phone, a Surface, or another tablet), as a trusted device to use with your Microsoft account. When you use a trusted device to perform sensitive actions like resetting your password or managing your billing info, you can automatically verify your identity without having to enter a security code each time.
To add a trusted device to your Microsoft account
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Sign in to your Microsoft account.
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Under Password and security info, tap or click Edit security info.
Because you're changing sensitive info, you'll be prompted to enter a security code.
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Check your alternate email or your phone for a code sent by the Microsoft account team, and enter it in the text box.
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Select the I sign in frequently on this device. Don't ask me for a code. check box, and then tap or click Submit.
You can now edit your info on this device whenever you want, without entering another security code.
