I am experiencing the SAME problem on my unlocked 3g iphone FW 2.2.1 on T-Mobile!

I don't know what's going on! Is it from something I installed recently? I just did the upgrade for xGPS in Cydia last night...

Can anyone please help??? This is so frustrating! My blank texts happens when I receive a voicemail (the voicemail notification dot no longer shows up now) and when I retrieve my voicemail, i get another blank text... and they are dated Dec 31, 1969 1:59 PM and Sept. 4, 2012 1:17 PM. What the heck is going on?