Under system settings -> call settings, there is an "Auto Reject List". This is the same list when the user pulls up a number in the built-in phone app and "Add to blacklist".
How to programmatically access this list?
If you have an Android phone, you may have come across the auto reject feature in your settings. Auto reject automatically sends your unwanted calls to voicemail, which is a very handy feature when you're busy or can't pick up the phone.
You cant, you have to create a listener and a blacklist yourself, take a look here:
How to filter incomming calls (blacklist) - no reflection
And here:
Android 4.0 Telephony API with blacklist for phonenumber
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