Hi All,
We've discovered a product bug specific to certain mobile platforms (iOS being the primary one) that was not settting the correct value for the "Is Mobile Device" constraint. Our tests so far indicate that opens and clicks from Android devices have the correct value.
In the interim, you can use the "Platform" constraint instead and select the appropriate mobile platforms, e.g. iOS, Android, WinPhone, RIM, etc.
We apologize for the inconvenience. We've identified a solution and will be applying a fix asap this week.
TJ