I've gotten several missed calls starting with (469) 899-00XX over that past couple of weeks. They don't leave a message. Today I was able to answer and there was no one on the other end.

The numbers I've gotten phone calls on my cell are:
(469) 899-0083
(469) 899-0053
(469) 899-0023

I think it's just some kind of data mining. Have blocked all three and won't answer similar numbers.