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Yes, Call Block This unit can block calls by storing the desired items in the call block list beforehand (Caller ID subscribers only). “Block a single number”: The unit blocks calls from specific phone numbers stored in the call block list. “Block range of numbers”: The unit blocks calls that begin with a number stored in the call block list, such as a toll-free phone number prefix or certain area codes. "Block unknown CID": The unit blocks calls that have no phone number.
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