I have been experienciing this problem lately. I would try sending a picture txt on my phone and it will not send. I am using GO SMS Pro and I have in fact tried sending pictures through the default Messages app and it still does not work. When I try sending it shows that it is trying to send but it never fully does. I also tried sending to multiple people and does not work. This doesnt happen all the time but it has been happening quite often lately. Does anyone know what could be causing the problem? Thanks!