I've read some posts where people have asked for a program to select multiple SMS Messages for deletion. I got ambitious (or bored) and created one. Originally it was an app to export SMS messages to a CSV file (both Inbox and Sent) so I could save them to an Excel Spreadsheet. I then added the functionality to delete selected messages from the Inbox and Sent folders. It is written in C# and has been tested on the Q only. Visit my site
www.dburkinshaw.com for details. Email me and I'll send you the CAB file for installation (
dburkinshaw@dburkinshaw.com).
Enjoy.