"Unsolicited calls" refers to phone calls that are received without prior invitation or request. These calls are often seen as unwanted or annoying because the person receiving the call did not ask to be contacted by the caller. Full definition
We will never make unsolicited calls to you or ask for personal financial information such as bank details or pension documents. (moneyadviceservice.org.uk)
You are going to get unsolicited calls no matter what phone you use. (androidadvices.com)
I have gotten several unsolicited calls only one day after posting the resume. (riklanresources.com)