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Can’t remember exactly where it was but I saw the answer somewhere in the instruction that were sent with the phones.
Sorry, there was a problem. Please try again later.To unblock all numbers, press MENU # 217 on the handset > go to [BLOCK A SINGLE NUMBER] > press [SELECT] > press [MENU] again > go to [ERASE ALL] > press [SELECT] > confirm with [YES]. -M
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