Thank you for this information. I've been getting numerous calls everyday from this number. You can opt out of this on their website or call the number and opt out.

I AM ON THE NATIONAL DO NOT CALL LIST, CAN'T THESE IDIOTS GET A CLUE , THIS IS PLAIN AND SIMPLE HARASSMENT ,   SOME CRAP ABOUT GOD.... I DON'T CARE...

Received a call from 877-698-3261 on 5/22/2014 at 1:49pm EDT. Caller ID displayed "ONE CALL NOW". Did not answer and the caller left an automated message.

The content of the message appears to be some sort of pre-recorded public service announcement from Winters Property Management. I have never opted in for such a service.

Based on the comments posted here I have added the number to my GV block list.

I received a call from this number today at 10:15AM.  Since I didn't recognize the number, I didn't answer, but chose to look it up. No message was left.

I dialed the number and found out it was  one call now number from some group.  I opted to opt out of these calls.  Now to see if it worked.

877-698-3261 keeps calling me. They started at 5:30 this morning. They don't say anything or leave a message.

I received a call yesterday from 877-698-3261 but no message was left.
Called back today and it was a one call pre-recorded message.
"Hi I'm Dr. Warren from Cleveland Clinic Eye" etc......

This is a conference message phone service. Many companies use it to send out automated messages to employees. Schools also use to notify of school events.

do not answer.. hang up immediately

don't know this number stop calling. I am on do not call list

Same as the previous caller....message from Waste Management telling me of change to garbage/recycling pick-up.

It was a call from my refuse collection, left a message due to storm pick up will be delayed.

It's a service message from my Condo Association

received a call. Didn't recognize the number. let it go to voice mail. No message. Called number back. Auomated message says they did not call me, but (and I'm paraphrasing) check out our website. website is a pitch to use their service. Filing a complaint w/ FCC

Many of these such entities get by with the so called charitable organization exemption loop hole in the do not call list restrictions, meaning such organizations can all you, even if you are on the do not call list.

It was group message and it was informing me that my childs school would be delayed for 3 hours because of extreme cold temptures

Msg at 2 am with someone speaking an unknown language

I don't care how many churches, fraternal groups, school districts or country clubs think this onecallnow service is hot stuff.  It's still an unauthorized call !   I'm receiving calls from Shady Brook Farm, a real estate firm in Florida, another one in Texas and a school district in either Tennessee or Kentucky.  I'm filing a complaint with the FTC.  I don't want to have to opt out; they caller should set it up so that people desiring the service have to opt in.

CrankyGuy

It is a big help,its from Schools telling about Snow delays and closures and such.

This was an automated call from the Church group.  It looks like organizations can give them a mass message and they send to their members for programs/ meetings etc.

Oh! And you can go to the "www.onecallnow.com" thing and opt out. Your number will be deleted. Uh...supposedly.

You're on a list, somewhere.

Our school uses this. A Cub Scout Pack I know uses this. Churches, civic groups, sports associations ("Don't forget Opening Day pictures on Saturday! Everyone in uniform!"), etc...

Some organization you're in is using this service.

This number 877-698-3261 called knew my social my full name and was harrassing me

this is an automated system that my employer has implemented a program to alert us of any delays or cancellations similar to what our local schools are also doing  it is not spam.... if you are called by this company you have given them your number when you registered.

called it back it said go to 1 call now dot com something group messaging and some crap wish they would stop !

Left an automated voice message.  Turned out to be my Condominium's Association management reminding us of the upcoming annual meeting.  Nothing harmful.  

Leave me alone

I got phone call at 9:23 PM. I did not answer the call.  I looked the number up and came to this site.  One message mentioned tornado warning.  I looked at the storm alert map on the interent and a storm was moving through my area.  3 minutes later the Tornado Sirens went off in my neighborhood.  Long time ago I signed up with American Family Insurance Co. for their alert system.  I think this may be it.  No message was left.  I'm still here so guess I dodged the tornado bullet!  It's raining really hard now, Wisconsin.

4 calls in between 1:26pm - 2:44pm. No messages.

Update:

it appears that there is an opt-out link: http://www.onecallnow.com/corporate/opt-out
However, it doesn't look like you can opt-out of a specific group, its an all or nothing.