SMS Message sent, but recipient did not get it.

Solution 1:  Recipient phone # or e-mail address entered incorrectly. Make sure phone number was entered as 00 or +, Country Code, Phone Number. Make sure e-mail was entered with a space between the e-mail address and the message.  For a Telstra SIM and Telstra SMS, the phone number is all that is needed, e.g. 0409xxxxxx.

Solution 2: Check expiry period.  If recipient did not turn on their phone within the expiry period, message was deleted before delivery.