I looked at my phone and saw a missed call and a text message from a blank phone number. I was incredibly confused!
Soon thereafter, I checked the voice mail, and I got another text message from blank phone number, with blank content!
It looked a little something like this:

December 31, 1969 5:59 PM? September 4, 2012 6:10 PM? I feel like I’m being given a secret code!
I googled to no avail. But, I searched MacRumors, and according to a post in a thread regarding this very topic:
The network sends a notification from the tower to the phone to send a v-mail notification and then when you check your voice mail it sends another notification to your phone and then it would say on your iPhone that you no longer have a new vmail. but because of the fact thats its not a TMOBILE PHONE that the signal is sent differently to there exclusive phones. So not only the iPhone will be affected other unlocked phones will have similar problems.
Update:
A user at the hackint0sh forum called T-Mobile in a thread:
Apparently they have been making updates to their software in the T-mobile system over the past few weeks. Part of the updates they did were to the speed up the internet on the network, but in the process they screwed up the voicemail notifier settings. They told me it is not a priority to fix it since the problem is only happening on phones they do not currently offer.
…
The only solution for the time being is to have T-mobile disable the voicemail notification. In this case you will no longer receive any text messages or a dot indicator when you receive a voicemail.
Apparently, T-Mobile is working on this issue. Ack! Hope this helps, and that they can fix it soon!
Have you had any fun messages or a different timestamp? Have you found another thread mentioning this issue? Have you called T-Mobile? Let everyone know here in the comment section!
Continued confusion Current lifestamp: April 28, 2009, 9:20PM. Awaiting future self to discover content based texts, rather than blank whispers into the void.
We know that December 31, 1969 is the birth of UNIX timestamps (corresponding to the UNIX timestamp “1″). But what is the significance of September 4, 2012? My precise timestamp above converts to 1240971028. I’ve continued to receive Voicemail texts – all for September 4, 2012, but at more times: 7:14 PM, 10:04 PM, 11:16 PM – with no correlation to the actual time of either receipt of voicemail or checking. And, my initial message is the only one from 1969.
It also seems that if you had a voicemail red dot prior to the text messaging weirdness, you cannot get rid of it. Whatever voicemail state you were, you continue to be. This is because these blank texts are your voicemail notifications – and your iPhone doesn’t know how to process the new T-Mobile notifications. Anyone know how to get rid of the red dot, just for the sake of aesthetics? Let us know.
A quandary, no doubt. Lots of conspiracies in the comments. Any to add?
Good news!
I received missed call and voicemail at 11:52AM Central Time on April 30, 2009, and I received a Voicemail dot! That means no text message! And the Voicemail dot went away when I checked it. So looks like situation normal. Everyone rejoice.
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