My iPod touch 4th generation has a small circle in the bottom right corner of the lock screen and it won't let me type my password in? How do I fix it?
You likely have the Accessibility VoiceOver turned on. To turn off see:
iPhone: Configuring accessibility features (including VoiceOver and Zoom)
Try triple clicking the Home button and unlocking and going to Settings>General>Accessibility and turn it off. Use three fingers to scroll the screen there if necessary.
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