Me with a iPhone 4S and my wife with an iPad2 have experienced some unusual iMessage activity. While exchanges messages on Saturday, a 3rd party suddenly inserted messages (2times) that could be characterized as broken English and originating from outside the U.S. Looking back on our recent message thread, there were one or two other messages that we originated that contained garbled text. Has anyone else experienced any thing strange with iMessage? Should we be concerned with our experience? Are there any security precautions that we should take?