| Option Value | Option Description |
| 0 | Connected: The telephone number is connected. |
| 1 | Disconnected: The telephone number is not connected. |
| 2 | Indeterminate: The telephone number returned an indeterminate status. The system could not reliably determine if the number is connected or disconnected. |
| 3 | Invalid authentication information. Please check your Phone Number Account Key. |
| 4 | Your account has been suspended. Please contact support. |
| 5 | The required fields are not present or malformed. |
| 6 | Internal system error. Retry again in 60 seconds. |
| 7 | Excessive web service calls made. Retry again in 60 seconds. |
| 8 | Unknown error |
| 9 | No phone number provided. |