#iPhone #Trick #Tip
You may not always be able to decline a call on your iPhone.
The "slide-to-answer" bar appears if your iPhone screen is locked.
The decline and answer buttons will appear if your screen is unlocked and open.
When your iPhone is locked, clicking the sleep button on the side once will stop it from ringing or vibrating, a second click will decline the call.
If you press the lock button once, your iPhone will cease ringing or vibrating. The call will be declined after the second click.
Note: Because your voice mail will activate sooner than expected, the incoming caller will be aware that you've chosen to decline their call.
iOS 15 Tutorial for iPhone and iPad.