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Hello, great question. To block a call on the Jitterbug Flip2, you do need to know the number as it needs to be added to the block numbers list. You can find information on how to block numbers on page 47 of the user guide.
Sorry, there was a problem. Please try again later.You can block a number. I don't see a setting where you can tell the phone not to ring if the caller is unknown if that's what you are asking.
Sorry, there was a problem. Please try again later.Specific numbers can be blocked but I don't think unknown calls can be blocked
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