If you cannot remember the exact number you blocked, you generally cannot unblock it using *80 . You will need to access the "Call Log" or "Caller ID History" on your physical handset to find the number again. Some provider services allow you to dial *60 and listen to a read-out of your current blocked list.
If you are unsure who your provider is or if you have a specialized VoIP line (like Spectrum Voice or Xfinity Voice), check your monthly bill for specific instructions or codes. how to unblock a number on landline
Modern cordless phones have built-in phonebooks and block lists. If you blocked a number by pressing a “Block” button on the handset, you must unblock it via the handset menu. If you cannot remember the exact number you
Because landlines don’t have the intuitive touch-screen interfaces of smartphones, unblocking a number can feel like a guessing game. The method you use depends entirely on your service provider and the type of phone you own. If you are unsure who your provider is