I keep receiving an error when trying to send a text message to a friends phone whom I have successfully sent numerous text as recent as yesterday. I was wondering if anyone was aware of what this particular error code translates to as well as any other error codes that may appear so that I can understand the problem? There is no help option nor am I able to google any answer that is simple or to the point without needing to decode and understand tech talk. Thanks to anyone willing to help or give this a shot!!

Current Error Message. HTC PPC 6800 With Windows Mobile service provided by Alltel. Recipient of intended text has Alltel as well. I have checked and sent Text to other correspondents whom have received text and sent reply.

Text Messages Retry
Error Class: Temporary
Cause Code: SMS Trm.D.

Message failed would you like to retry?