No voice message left.

Never leaves a message. Looked up the number and it belongs to Lighthouse Research in Riverton UT

This is Lighthouse research.  They pay people to participate in surveys and radio research.  I've done it a couple of times, they pay about $60 for about 3 hours worth of work.  You just listen to music and rate how much you like the song.  Pretty easy money.  It's how radio stations decide which songs to play on their station.

Called and leave nothing at my voicemail for few min.

http://www.go-lighthouse.com/products_services.html
Looks to me like they're guns for hire. Perhaps there was a positive experience, but it looks like just another telemarketer burning up time as life passes them by.
Mike may have been invited as part of a local audience that was called to attend a focus group.
That does not explain any of the other calls.

Besides, it belonged to Arrival Telecom
http://www.arrivaltel.com/info

scammers