Hi all, So I haven't had a problem in the past on my iPhone 4, but today when I was trying to message a few friends who have iPhone's/iMessage, it was showing as a text. It didn't switch to iMessage after any amount of time/didn't detect they are on iMessage. I had to send them a text, their reply came as an iMessage, then I could iMessage them. Anybody else experiencing this? Is there something I can do to fix this? I don't want to text the person first if they are overseas. Thanks!