I think my wife uses a secret sim card… Very often when we call on Skype you hear that her p8 vibrates. She always says that it's email. Would the phone vibrate when it speaks with a number via Skype and gets a whatsapp on the other?
Whatsapp is a service that works over the internet.
As a result, even without a second sim card messages can be received or sent even while on a call.
Great, so it may be that she receives a message while she talks to me with the other
Try to trust your wife and show her. The alternative would be open and honest to talk about everything else you make yourself only broken.
I know the number… She denies it
Everything was just a misunderstanding!
