Who called from 2560000000

Called 2/12/16. I didn't answer and they didn't leave a message.

this number called us back to back on 2 different phones

Same message as everyone else...young girl that says sorry wrong number. My wife got same number call 2 times in last few months.  Very suspicious.

I got a call from a lady today, said she had the wrong number and hung up.

Got the same call today, 256 area code is in Alabama. I think it's a robo dialer collecting valid phone numbers to sell to telemarketers.