Who I have the same questioned this topic

I have tried twice to delete and add again. Still comes up as unknown. No, both numbers are stored under his contact name. It only happens when he calls my number from his office phone. When he calls our home landline from his office phone, it shows the caller id number. When he calls my iphone it just shows unknown. This did not happen until I upgraded from the iphone 4 to the iphone 6.