As soon as I received a call from this number, I blocked it, thanks to this web site.  Let's see how they feel not allowed to call through after the first ring.....LOVE call blocking from Comcast!

Called and left no message.

Did anyone here just get a tracphone? I've only had mine a few days, I've given no one the number, but I got a call from 510-686-4991, no message left. Maybe tracphone is selling the numbers?

Same as everyone here..  The call came into my Google Voice # which VERY few people have.  I did just list that # when I registered a Visa Gift-Card-Mall Card yesterday so I could make an online purchase.  Did anyone else register a GCM Gift Card Card of ANY kind?  If so, I bet that's our culprit.

Same, called my cell phone for half a second then hung up.

Just had the same thing happen!

What the heck is hey cosmo...from area code 510??? and where do they get cell phone numbers???

Sex Company

They did not leave a message and I need to find out who this is.

They did not leave a message and I need to find out who this is.

510-686-4991 and did not leave any message.

I don't want Hey Cosmo calling my cell phone number NOW or EVER.  These companies are so annoying.  My cell is reserved for important calls only since I have a limited plan.  What a pain.

They just called my cell!

the same number called me , no messeage left  and when i called back somthing bout cosmo bs and be recored

Yup, this one called up last night  (Oct 19) around 7pm.

Monday, this # called my husbands cell, 1 ring, no msg left.  Weds evening, this # called MY cell, 1 ring, no msg left........how could they know BOTH of our cell #'s which are not listed anywhere?

CALLED AND HUNG UP.

CALLED AND HUNG UP.

They just called me and left no message.

They just called me and left no message.

Ring. Ring. Ring. Hello? Hello? ... Click.

You have just received an abandoned call. Many of us know this extraordinarily annoying script all too well. After the rage subsides, especially if you got out of bed for this, your next thought is probably questioning why anyone would bother to call and not say anything. Let's examine the sources of abandoned calls:

-- Agent Not Ready

High volume outbound callers such as surveyors, debt collectors, politicians, telemarketers, etc. all try to maximize their resources. Given the general unpredictability of answers, callers resort to using multiple lines per agent employing dialing strategies known as predictive dialing and power dialing. Predictive dialing utilizes a pacing algorithm that factors agent availability, average call times, and answer rates in an attempt to maximize agent talk time with the lowest possible abandonment rate. Despite clever pacing, agents are inevitably unavailable for all answers and abandonment occurs. Power dialing maximizes agent talk time by continuously dialing all available lines. This results in astronomical abandonment rates. Legend has it, back in the day before compliance, one enterprising storm damage repair company would power dial 25:1, that's 25 lines for every agent! They would engage in a carpet bombing campaign after a major storm and beat their competitors to the insurance claim feast.

-- Voicemail Fishing

Many robocalls aren't intended for a live person at all. If the message is targeted for playback from your answering machine or voicemail, then the call will likely be terminated if a live person answers. Dialing systems often incorporate a feature known as positive answering machine detection. While machine detection is an imperfect science, this generally provides callers the opportunity to play the message or end the call based on the answer type.

-- Psychological Warfare

Has your ringer ever pulsed a time or two and you picked up to find dead air or an open line? This is straight from the playbook of a debt collector. Unsurprisingly, a collector's sole mission is to motivate payment. A collector doesn't need to speak to you to directly to let you know that they are thinking about you, your debt, and your credit score. Simply seeing the collection agency's number in your missed call log is a reinforcing action.

-- The Probe

Modern business is no stranger to measurement and quantified optimization. The simple act of answering or not answering the phone tells quite a story. We live a life of patterns with tendencies to work, eat, and watch TV, etc. at roughly the same times each day. This includes availability to answer the phone. Probing calls are logged and analyzed to build an answer profile demonstrating probability to answer the phone. Targeted calling campaigns can be optimized by preemptively building an answer profile with probing. This allows for the best allocation of staff and lines. Probing isn't necessarily performed in isolation as it can be incorporated into any of the above mentioned practices.

-- Follow the Money

There's a saying that following the money will lead you to the truth. Abandoned calls walk this line. It's all about resource management with little or no regard or respect for the recipient. Ever cheaper long distance and sophisticated dialing systems will likely fuel this bonanza for years to come.

called no message

same here, called and left no message. then when i called back, it was automated

I just received a phone call from that same number 510-686-4991..I dont want them calling me. Does anyone know who it is?

Funny I just recieved a call from that number same thing no message, but difference here is I just got this phone 2 days ago, Who is it?

I don't who or why I received a phone call from this number (510)686-4991

Cell Phone barely rang 1/2 a ring but left this 510-686-4991 number ..just before 6pm
It's from San Francico area

Called me, phone rang like twice, left no message.

I called back and got some automated message. Something about Cosmo? I got weirded out when it said something about 'retrieving record' and then hang up.

who are you?

Called but left no message