What does it mean when a man says, "thank you for calling."

In general? multiple opinions encouraged. thanks!
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+1 y
guess I need to elaborate. Have known this man for 3 years, we have talked periodically throught the years. It just threw me off because last time we talked he said "thanks for calling"

Hes never said that before.
What does it mean when a man says, "thank you for calling."
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