i have something that i think is related. when i send text messages to other people, i will get the check mark. sometimes it may take 2 minutes, sometimes it will take 4 minutes, it varies, then a small "D" will appear. What does that mean? Does that mean it was actually opened and read by the recipient? i thought a check mark meant it was successfully sent. i also thought that the checkmark with the "d" only showed up when you were sending a PIN to PIN message to other blackberry users.
Check means it has been successfully sent from your BB and accepted on your carriers network. A red X means it failed. A clock means it is waiting to be sent.