Class 0 SMS (Short Message Service) text messages aren't stored in the memory of the message recipient's cell phone. Unless saved upon review by the message recipient, Class 0 SMS text messages disappear after being read. Class 0 messages can also be used to "ping" another cell phone. They can receive confirmation of a recipient's messaging capabilities without the recipient even knowing they were pinged. While Class 0 messages can be abused, they can also be an effective troubleshooting tool for SMS communication.
Send a Class 0 text message from your Windows Mobile 5 and 6 devices with HushSMS. This free utility allows you to send Class 0 and standard text messages. Before sending your text message through HushSMS, simply select the program's "Class 0" option to send the message as a Class 0.
Send Class 0 text messages from the web, using the DeleSMS online SMS utility. DeleSMS allows you to send Class 0 SMS messages worldwide. To send your message as a Class 0 SMS, simply select the "Flash SMS" option before sending your message. You can send standard messages with the "Default SMS" option.
Download a free copy of Symbian Toys' FlashSMS utility for your Symbian based cell phone. FlashSMS only handles Class 0 text messages, so all that's needed to send a Class 0 SMS is a recipient and a message. Though free, Symbian Toys awards users with added functionality with a donation to the site. You can send multiple Class 0 text messages at one time after donating.