They have called my house numerous times after 9:20PM.  I answered once and told them that it was entirely too late to call for this type of soliciting and that I did not appreciate it.  Now they just call and fail to answer if someone picks up from this end.  Caller ID only shows as "UTAH".

Don't know who this is but they keep calling and they never leave a message.

This appears to be Survey Sampling International, you can check them out at surveysampling.com    If you do not wish to speak with these people and you have the ability to block numbers, then you will want to block the following:

385-207-703x
385-207-704x
385-207-705x
801-823-202x
801-823-203x

From their website:  SSI (www.surveysampling.com) is the premier global provider of sampling, data collection and data analytic solutions for survey research, reaching respondents in 78 countries via Internet, telephone, mobile/wireless and mixed-access offerings. Additionally, SSI staff operates from 26 offices in 18 countries, to offer CATI, questionnaire design consultation, programming and hosting, online custom reporting and data processing. SSI serves more than 3,000 clients worldwide.

Call late at night 10:10   10:20

I am on a do not call list and do not want these calls.  Have not been answering them but the voice mail picks up the call and they never leave a message.