They called at 8.44 pm on my cell and left no message.  I did not hear my phone ring so did not answer.  Anybody know who these people are?

All these calls from area codes 801 and 902 are owned by terrorist groups planning attacks against the USA.  That’s correct they send out thousands of call per day to non-terrorist phones to hide their communication activities to other terrorists from the FBI/CIA /Homeland security.   One out of 100 outbound calls are solicitations for products, buying these products only gives money to the terrorist groups.  Adding your number to the DO NOT CALL list will do nothing to stop the calls.  It is your patriotic duty to contact the FBI and report these numbers as terrorist activities that require criminal investigation.