Hello Darling Shall I,,,

In a bar, a man answered a call of a ringing mobile
Man: Hello!
Wife: Darling shall I buy one diamond ring?
Man: Sure honey!!
Wife: Shall I use your visa card for Crystal set?
Man: Okay no problem dear!
Friends around the Man: Woow Great to see that you love her that much!!
Man: Hmm! Ha!! By the way, whose mobile is this?!!!?