Every since i updated i can't imessage anyone. it just says undelivered either on my iPhone or mac and my friends imessages are coming to me as a split of texts and emails in mail. What is going on?
i've been having the same problem since installing 5.1. I've tried disabling/enabling imessage on my iPhone, and even reinstalled messages on my mac. still says undelivered, but the person is actually receiving my imessages...