I've had my iPhone problem-free for a very long time already, until today. I try to listen to my voicemail, and I get this really weird text message (pictures are attached). The thing is that every time I listen to my voicemail, a text comes up every single time. I check my text message usage but strangely, no text has been recorded being received by my carrier. I plug my SIM card into another cell phone, and I didn't experience any of this. The even more bizarre thing is that this text is sent on September 4, 2012, which hasn't even happened yet. What is wrong with the phone? Is this a bug on the phone or something? Thanks!