How do i erase a message in my outbox on my motorola razor?

i have a motorla razor and i sent a pic message and now i cant delete it? it says (can not delete locked message) also i am trying to delete another and it says (message has not been sent delete it anyway? and i put yes and it will not delete it how can i delete these messages? |||may be a quirk in your software. See you wireless provider....they will have the answer for you.