Why is incoming call blocked if not on reject list?

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You can put them on the Reject List (Menu/Address Book/Reject List) and push Option/New/Number. You can download the manual here... http://www.samsung.com/us/support/owners/product/SGH-A837DKAATT

yes, in phone number recall area. number history. find number you want to block hit settings then add to reject list.

1
Go to the main menu on your Samsung cell phone. Press "Tools & Settings" or the similar section listed under the first-level menu options.

2
Press "Call Settings" or similar. You will be taken to a list of options for receiving your calls. Select the "Call Restrictions" option.

3

Under "Incoming" select "Yes" to program your phone to automatically reject all incoming calls. On some models you can also set the phone to restrict calls from anyone outside of your contact list, or only from callers who are on your contact list under the "Call Restrictions" menu.

You can't block incoming unknown calls, but if you don't accept the call, you will not pay for it.

go to settings call settings then all calls then auto reject go to reject list then unclick unknown that should be job done.

Go to settings = application settings = call = all calls = auto reject = reject list

Settings> Application Settings> Call> All Calls> Auto Reject> Reject List> Delete

go to - menu-> settings-> application settings->  call->  all calls->  auto reject-> (scroll one down) reject list->
[on the reject list uncheck number you wish to remove from the reject list. ]

-this is the most accurate answer, trust me.

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2 types of lists with different functions will keep unwanted calls hidden from your eyes. You have one blacklist and one or several Allow lists. Only one list can be activated at the moment.
Blacklist contains numbers you want to be blocked. You can add numbers from recent calls, contact list or just by typing them. If you reject a call manually, the software will propose you to add that number to blacklist automatically! Blocking of Private and Unknown calls is also available.
Allow list contains numbers which will be allowed to receive while others will be rejected. In addition, you can choose a "reject" action to return a prewritten text message back to the caller. A notification of the missed calls appearing in a popup note can be set by user as well.