Every night at around 1:15am, I receive a text message on my iPhone (4S) from an unknown (blocked) number that is either blank, or something like !@ or !?. Every time I receive the message, the time shown for the message (in the messages app) is 10-something AM, December 8, 2015. I cannot send messages back to the sender, nor call it back, but when I tried FaceTiming the sender, it said "facetiming animStart12xxxxxxxxxx. Every time I facetime the sender, its a different 12 digit code starting with 12, and animStart at the beginning. Any ideas? It's driving me insane!