Which calling app is being used?

[godless]

I am not sure which app it is that my wife is using but she is making (or receiving?) calls that use our available minutes so that on our bill it shows how she used 400 minutes but you add them up and it only comes to 200 minutes. It also shows the the phone number is her own and that it used only 1 minute. Does anyone know which app she's using?

Thanks