Tmobile and unlock iPhones

So a couple days ago I started recieving a text message dated 1969 from no sender with just an "@" in the text.  I then started narrowing it down to the fact that anytime I did something relating to voicemail I received it.  Frustrating, because if I listened to a voicemail, I recieved this text and the dot wouldn't disappear.

Apparently Tmobile is aware of it and 'working' on it.  There are a few message board threads popping up in regards to this.  Hopefully Tmobile gets this under control because apparently it's affecting all unlocked phones.

http://www.hackint0sh.org/forum/f127/71287.htm

http://forums.macrumors.com/showthread.php?t=690897&highlight=2012