Who called from 2560000000

Got call from 256-000-0000 on my cell phone, did not answer, a minute later co-worker in office got same call which he also did not answer. We have similar pohine numbers area code and first 3 digit. Live in NW Ohio

Also received a call from 256-000-0000. Girls says "oops wrong number". I just shouldn't answer these calls and let it go to voicemail.

same call at 3:30, no one was there

It's for voice recognition technology.  That is my opinion.  My voicemail is generic and not my voice, I will not be answering calls from this number after seeing the caller always has the wrong number anyway.

I got the call - same way in Michigan at 545pm on Cell and 830pm on home number.
This is strange.  I put the number in not accept call list on cell phone.