Blue Cross Blue Shield of Wyoming is warning customers about a nationwide wave of robocalls that claim to be from the insurance company.

The company says the calls appear to be made for the purpose of marketing insurance products by using the Blue Cross and Blue Shield brands and coincide with enrollment periods for Medicare and the Federal Employee Program.

They say the robocallers’ identity is masked by “spoofing” technology, making it extremely difficult to identify the source and take action to stop the calls. The technology also allows for the same calls to appear to come from different phone numbers.

The company is encouraging customers to be vigilant, protect their personal information and guard against providing personal information during calls that claim to be from Blue Cross.