Additionally, the UPA requires them to call on the last day off sometimes, so when they call it's not necessarily fishing or trying to trick us. Expect to be called and just don't answer the phone.

20-K-7-c Assignments made from 1500 to 1759 on the last day off prior to reserve days shall be placed in the Pilot's schedule and the Company shall notify the Pilot by phone.

Also, a Did You Know says that they're likely to call for all assignments now. Expect to be called and just don't answer the phone.

"the crew desk’s current policy is to call all numbers on your Master Schedule and ensure you are properly notified, even in cases where the UPA does not normally require the crew desk to call."

https://www.alpa.org/~/media/UAL/Fil...ssignments.pdf