This Movie is SO STUPID
If he suspected it was his wife he was talking to, wouldn't he have checked the number he had for her with Information and see that it was listed under HER name, and not the fake name she gave him on the phone? And if he did this, why would he continue this dumb charade.
But even if she were unlisted, this movie sucks. Any woman who is still interested in her husband after she finds him to be a conniving, low - life Philanderer is a completely DUMB DOORMAT.