Instructions:
You can only use this program if you've a VoipBuster, VoipRaider or VoipStunt account. (or similar to one of those)
Before using it, make sure that you've set the settings.

URL:
For VoipBuster: https://myaccount.voipbuster.com/clx/sendsms.php
For VoipRaider: https://myaccount.voipraider.com/clx/sendsms.php
For VoipStunt: https://myaccount.voipstunt.com/clx/sendsms.php

Username: your VoipBuster username
Password: your VoipBuster password
From: your own phonenumber in international format without spaces. (for example: +31123456789, +31 for The Netherlands)

For Smartphone users, please download this software here (v0.1 - 124 KB) or its mirror here.

Update Description:
v2.2.0 (11-04-2008):
- Incoming messages can be intercepted. (total interception or saving a copy).
- Favorites can be ordered (via context menu).
- SIP is opened on startup.
- Action button can be used to add the selected contact to the recipients.
- New form to view inbox and/or sent items.

v2.1.3 (28-03-2008):
- Option added for setting a delay for the auto-complete functionality.

v2.1.2 (15-03-2008):
- Option added for default country number.
- Incorrect number formatting.

v2.1.1 (10-03-2008):
- Solves an issue with multiple favorites.
- Solves an issue when no contacts are available.

v2.1 (07-03-2008):
- Unlimited favorites.
- Auto complete when typing in the recipients textbox.
- Multiple recipients.
- Improved progress window.
- Fixed some minor bugs.

v2.0 (28-02-2008):
- Send message progress moved to a new form.
- Support for multiple accounts.
- Support for favorites.
- Sent items are sorted correctly now.
- Sent items can be deleted (all or just 1).
- Import/Export functionality for sent items (with new open file dialog!).
- Possibility to select a default account.
- Improved performance.

v1.6 (20-02-2008):
- Improved performance.
- Sent items can be saved in XML or Text format. (Text format performs better, but XML is easier to export since it's a standard).

v1.5 (19-02-2008):
- Sending multiple messages after each other bug fixed.
- Sent messages can now be saved into XML format.

v1.41 (28-01-2008):
- Progress window closes automatically when message is send successfully (fixed).
- + sign will not be removed anymore.

v1.4 (27-01-2008):
- Support for multiple messages.
- Error result code fixed.

v1.31 (23-01-2008):
- Better feedback when the VoipBuster service reports an error.

v1.3 (19-01-2008):
- Progress window will close automatically (after 1 second) when a message is send succesfully.

v1.2 (20-12-2007):
- Caller id bug solved. (thanks Muthas).
- New icon.

v1.1 (12-12-2007):
- Issue with formatting phonenumber solved.