Who called from 4121231254

unknown name and no idea who it is

i have gotten 2 calls in two days from this number they dont leave a message and I have not answered. they are calling my cell phone...any ideas??

no known details

Called at 12:18 PM  when the answering machine answered they hung up.

I've gotten 2 calls in two days also... They are calling my cell, when I call back it says the number can't be completed as dialed, please check the number and dial again or call you customer service center.. Maybe it has something to do with verizon?