When my iphone is calling i see these 2 options! What's the different?

Sometimes i see "slide to answer" sometimes i see 2button: answer and decline
What's the different? When which appears?

They both do the same thing.

Slide to answer appears when the call came in while you had your phone locked in your pocket.So, you "slide" to answer, the same way you "slide" every time to unlock your phone.

The two buttons appear instead, when the call comes in while your phone is already unlocked; that is, for example, you were browsing the web and all of a sudden your friend calls. You don't "slide to answer" because you already slid it to unlock it when you pulled it out of your pocket.

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