Blackberry Curve 9315 won't send pictures?

I just got this phone last Wednesday. For the first two days it sent pictures so fast, now it won't send them, just a red clock pops up and the person never get it.

I've talked to TMOBILE support, they told me to pull the battery for 3-4 minutes, did it. They told me to go through all these phone settings and I did, Ive tried changing the picture size from large to small, I have a data plan yet, they still won't send. I don't understand why. This is a brand new out of the box phone.