If you are an iOS novice, then you probably thought it might make a difference whether the caller is present in the contact list or not. What if the iPhone shows ways to accept or reject a call for different smartphones? For example, for" native "gadgets on iOS – some, and for "androids" - others.
If the iPhone is blocked, then when an incoming call is made, a slider (slider) always appears on the screen with the message "Answer" and only it. In this case, you can reject the call in another way, for example, by double-clicking on the side power button.
If you are using a smartphone right now, iOS offers you the option to choose one of two buttons – red (reject the call) or green (answer the call).
Why do the "Accept and Reject" buttons disappear when an incoming call is made on an iPhone?
iPhone manufacturers have come up with this trick for security reasons. After all, if the blocked gadget is in your pocket, you can not exclude accidental button clicks. The smartphone interface changes when the screen is locked to avoid involuntary rejection of calls.