received call tonight from this number.  we didn't pick up and caller didn't leave message.  we have no idea who this is.

Calls once or more daily. No name on caller ID; just Florida. I don't answer any more since party hangs up.and never leaves message.

We check with Verizon an is a Verizon number no longer in service.

We checked with Verizon an this is a Verizon number no longer in service.

It's not Robert, I just spoke to him on the phone. He is retired. It's something else.

Called our mid-fl landline at 1.34p on 6/13/14.  Left no msg, caller id is the number.  Harassing scammers.

I think I've tracked this down.  The number is associated with F 1 Racing-simulators - Simxperience Florida Inc.  Their contact info is listed as:
Contact. ROBERT CLAIRMONT. CONTACT: [removed:info needs to be verified]

This phone number is their FAX machine so they are probably spamming fax machines.  When the call doesn't receive a fax signal, it hangs up. I'm going to try reporting this to FCC but don't know if it will help.

Calls daily.

Get a call from this number every several days -- pick it up and whoever is making the call immediately hangs up.  Attempt to call the number back and get a message that number is no longer in service.  

I've had the same problem.  Get one of these call blocker things.  They are fantastic.  I've been getting at least three calls a day from this number but I have it blocked so they never ring through.  All they get is a continuous ring on their end with not answer or answering machine.  It wastes their time and keeps me from being bothered by them.  

I've googled this number and get a variety of associated people.  Most in Tampa but a couple in other places.  Some come from "advanced background check" some from "whitepages.com reverse phone"  and some from other links.  Here are some of the names and addresses that pop-up as associated with this number:

Robert Clairmont
Phone number
813-621-2720
Address:10419 Bloomfield Hills Dr Seffner, FL 33584-2545


Nubia Y Chirinos
813-621-2720
Address: 2824 Anthony Dr Tampa, FL 33619-1812

Nichole R Blakely in Tampa, FL  |  Age 32 Background Report »
Also known as:
N/A    
4004 McLane Dr
Tampa, FL 33610
(813) 621-2720

Stanley D Garrison in Tampa, FL  |  Age 37 Background Report »
Also known as:
Stanley Dgarrison    
4004 McLane Dr
Tampa, FL 33610

and there are at least 10 others with the same number on the "Advanced Background Report" site alone.  So this is either a spoofed number or some sort of call number used by everyone associated with this "business" or scam.  Perhaps is some sort of VOIP that everyone uses.  Not sure.  Maybe the regulars that know more about this stuff can weigh in on possible explanations.
    
(813) 621-2720

Every day twice a day, on the landline so cannot block, call back, disconnected,  yea right, it's simply not right these asshats can bug us, and we can't get them back....gonna disconnect landline....

No messages left and can't reach anyone on call back. Number out of service.

Calls almost daily. Answer and no one is on the line and they hang up. Very annoying, and put the number on call block. Caller ID name shows Florida.

Number has been on caller id all this week.  Number called agao\in today, I was home so I answered but no one there.  Caller id states name as Florida.  I also called the number back and the recording stated it was out of service.

Calls at least once daily. After answering call is disconnected. Very annoying. On call-back intercepted stating "the number you are trying to reach is out of service"; then how can caller ID show this number as caller??

"Hello?" ?? can hear activity in the background...  no other response. Verdict: telemarketer/survey taker/pain in the a**.

When the receiver is picked up, the phone clicks off!  When dialed back a recording states that the number is no longer in service????

They just called me.