"8888" should work on Verizon for all phones--just make sure you enter "B" then a space, then the area code plus phone number. Don't add a "1" before the area code. To unblock, you use "U" then space then the number. You'll get a text message back saying the number has either been added to or deleted from your Block list. And it's free. I've had to use this feature for a particular phone number several times, and it's always worked for me.
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