: Open the Phone app , tap More (three dots) > Settings > Blocked numbers , and remove the number from the list.
Most facilities require inmates to submit a formal "Inmate Telephone List" (often limited to 10–15 numbers). If your number is not on this approved list, or if it has not yet passed the background check, the system blocks the call. how to unblock a prison call
Systems often block virtual numbers (such as Google Voice, Skype, or Vonage) because they complicate geographic tracking. : Open the Phone app , tap More