Number 1-720-250-0608 called my cell on 4/21/14 three times in less than 1 minute at 8:33 pm. Would have been 6:30 pm in Colorado I believe. No message, I will not answer if I don't know the #. no problems yet. thanks for the info.

Similar to above. My iPhone displayed no name for caller ID but said the call was from Denver, CO. Indian sounding caller claimed to be from Delta offered me two free tickets. I said it sounded too good to be true and he said "Thank you" and hung up.

It sounds like everyone else is just as clueless about the catch as I am. If it becomes apparent I'll send another update. I hope its not one of those that charges insane fees just for picking up.

Called left no message.

04/15/14
3:40 call saying from southwest airline. i said u have wrong number, "no im callin for you"
"what is my name then"
"you, im calling for you"
"whats my name?"
"you"
"im hanging up now"
"why, im going to kill you"

im extremely frightend by this, she said that right as i was hanging up, i called frends and it wasnt a prank.
i called the number back... wasnt in service. .

update. They called four times while I was typing this. The first three were blank messages on my voicemail. The last was a message telling me to call them back at the 800 628 9180 number for my confirmation code. I called that number. It rang about 15 times and then got a fast busy. I, too, tried the 720 number that they used to call me and got an out of service message. Clearly a scam, just trying to figure out the catch so I can tell all of you.

I hung on the call for quite some time trying to figure this one out. They claim to be Highland Resorts and are inviting to a travel agency grand opening at the Denver Merchandise Mart. They gave a full address and phone number (800-628-9180). They asked if I wanted either tickets or a free cruise. Playing along, I elected the cruise. They said that I will be getting a free cruise for two and round trip tickets. They didn't ask for any personal information other than name and to answer if I had a visa or mastercard. They scheduled me to come to a presentation on Friday at 2:00 PM. They said that if I watch the presentation, and no obligation to purchase anything, then I will get a free cruise and airfare. They provided their address as 451 East 58th Ave, Suite 1156; Denver, CO 80216. When I go, I am to watch an audio-visual presentation, no strings attached, and get a cruise. They then said that they will be calling me back in ten minutes to confirm my attendance. I assume this is where the scam will come in. If I hear back, I will update further.

Telephone rang -- not long enough for answering machine to pick up.  Another unsolicited call. Caller ID spoof. Number has been disconnected.

8:45 PM on a Friday, got a call on my cell phone from this number. It was a woman - possibly Korean (?) but speaking very good English. She started saying "First of all, you don't need to worry, this is not a sales call" and I hung up.

4/8/14 @1450 hrs. got a call on my cell that I NEVER get solicitation calls on.  Caller sounded like they had an asian or indonesian accent.  Something about "Highland Rewards" or "Research".  Knew what metro area I'm in.  When asked how they got my number, she disconnected.  I called back from my work phone and got a recording that the number is disconnected.

foreign voice, some promotion, I passed and they were ok

Called at 6pm, 3.29.14.  ID came up as "Office Manager".  Did not answer.  Phone did not ring enough times to go to Voice Mail.

Claimed to be with Delta Airlines. But sounded like from India.

Calling my house

Called California at 8PM. No message. I called the number back and got a recording that the call couldn't be completed as dialed. Hung up and the same number called a minute later. Obviously a scam.