Calls can be blocked on Sprint. You can block inbound and outbound calls for up to 50 phones numbers. Enter each 10 digit phone number below or quickly add numbers you've previously blocked by accessing your archive list (archive list numbers will be saved for 90 days). Archive list - showing the most recent 100 entries.
Here's a how: Sign into account, go to my preferences > Limits and Permission > Block Voice > click on radial dial for "Block only the following phone numbers for inbound and outbound calls" > enter phone number to be blocked
They called me two or three days ago and asked if I wanted to be a part of a survey before I hung up. The next day they called at around the same time which I did not answer, and then again today at the same time.