Sign in with your Apple ID - Apple Support
https://support.apple.com/en-us/HT204053
Sign in on your iPhone, iPad, or iPod touch Open the Settings app. Tap Sign in to your [device]. Enter your Apple ID and password. If prompted, enter the six-digit verification code sent to your trusted device or phone number and complete sign in.
Open the Settings app.
Tap Sign in to your [device].
Enter your Apple ID and password.
If prompted, enter the six-digit verification code sent to your trusted device or phone number and complete sign in.
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