I had missed call, too. It is some service at this website "http://www.heyosmo.com". I didnt investigate any further. dont really know what it is could be a front for a scam of some sort.
I received a call from this number well not me but my younger sister. i found out that these people where chargingn my phone bill 9.99 dollars a month for their information I blocked it, now they are not charging me but they are calling me. So I called back and pressed 3 to get my number block from them at least that is what they said.