[ChrisH09]

Go download Advanced Config....run it and look for SMS or Text message notification...enable it and do a soft reset of the phone....this should give you notification that your message was sent.....yeah 6.1 it was on by default....and they only allowed teathered messaging....now in 6.5 they allow either classic or teathered...but no option to have message sent notification. Do you have a Airave device in your place? This may be causing your issue if so...I have one and depending on the server its connected to the time/date stamp is sometimes off....so my messages are all out of wack in my inbox......if not, call HTC or Sprint and ask them to see if they have a way to resolve it.