What’s a trusted device?
Once you’ve set up two-step verification when you log in and are asked to enter a verification code, you’ll have the option to trust the device and browser that you’re using. This means that if you log in using the same device and browser you’ll not be prompted for a verification code on future logins. If 30 days elapses before your next login, then the trusted device and browser will be removed and a verification code will be required. The same device and browser can then be trusted again.