The Short Message Service VIs can return the following error codes.
| Code | Description |
|---|---|
| 1 | Invalid input. There is an incorrectly formatted phone number, a blank phone number, or an incorrect call ID. |
| 2 | Not supported. The device is not a phone-enabled PDA device or the LabVIEW SMS support is not installed. |
| 18 | Unable to complete phone operation. |
| 19 | Phone line is currently not available, in use, or busy. |
Error codes and descriptions are located in the following header files, which are located in the C:\Program Files\Windows CE Tools\wce420\POCKET PC 2003\Include\Armv4\ directory: