Ios 15.1 - iOS 15.1 is rolling out to iPhone users today, here's what's new

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Unlocking is the process of removing this restriction to be used with any wireless network.

It was originally planned to also notify parents of children under 13 if they choose to view flagged messages anyway, but this was removed due to concerns about abusive parents.

FaceTime itself gets an update with spatial audio for immersive sound, portrait mode to keep users in focus, and two microphone modes that can eliminate background noise or allow it all through.