Have a different landline system? Mention the brand and model in the comments—chances are someone has solved it already.
These star codes vary slightly by region and provider. In some areas, *60 is the block list, and *80 is unblock. Check your phone bill or provider’s website if unsure. how to unblock a number on a landline
Small devices like or Sentinel plug between your wall jack and phone. To unblock: Have a different landline system
To unblock a number on a landline, the steps may vary depending on your phone service provider and the type of phone system you're using. Here are some general steps you can follow: *60 is the block list