So this is a problem on all three Iphones we have (2x5s and 1x4s) and that were updated to IOS 7.1 (that's when the problem appeared for the first time). If we send pictures via IMessage, the pictures always show not sent/cannot send picture with the little red exclamation mark next to it. But the recipient most of the time gets the picture, although it shows as not sent. I searched this forum but could not find anything. Is this just us?