I’m really freaked out…?

I've been receiving text messages (starting today) from an unknown sender. My phone doesn't even say "unknown" when I recieve the message...the place where the sender name should be is blank. In the text field, there's no message. And the date of these messages- December 31, 1969...and the time stamp on every message is the same: 3:59pm. What the hell is this about? I have an iPhone if that matters...this has never happened to me before with any other phone or with the iPhone. I'm not sure what's going on...I kinda sorta believe in supernatural spiritual stuff, so I'm wondering, is someone trying to tell me something or communicate with me, or is there a glitch with apple? I'm really getting creeped out here, and if someone could help me out or give me some insight, I'd be much obliged. I know! It IS creepy! I looked online, and there are some sites where u can send annonymous text messages, and I tried them on myself and some friends (I told them what I was doing) but every site I tried gives a sender name like "noreply@textmenow.com" or "Annonymous" or something like that....NOT ONE of those sites leave the sender name blank, like the ones i've been recieving. I'm really freaked out now...