Contact the author of that addin, whoever it is, and see what's going on.

Signature
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007
Reminder Manager, Extended Reminders, Attachment Options
http://www.slovaktech.com/products.htm
>I am using the outlook Sms add-in but whenever I attempt to send a message,
>I
[quoted text clipped - 5 lines]
> using
> bluetooth.
Sue Mosher [MVP-Outlook] - 26 Mar 2008 14:52 GMT
I bet this is the Microsoft add-in, which means it might be hard to get answers from the author. I don't know of any specific format requirement. It's also not clear whether the error is coming from Outlook itself or the add-in. I'd suggest just playing around with different numbers until you find what works.

Signature
Sue Mosher, Outlook MVP
Author of Microsoft Outlook 2007 Programming:
Jumpstart for Power Users and Administrators
http://www.outlookcode.com/article.aspx?id=54
> Contact the author of that addin, whoever it is, and see what's going on.
>
[quoted text clipped - 7 lines]
>> using
>> bluetooth.