If you're looking for the Chase Mobile app for your Windows Phone 8 device, it's no longer available. We aren't sure exactly why the app was pulled but it may be due to a bug with the QuickDeposit feature.
QuickDeposit is a feature that lets you deposit checks by snapping a photo of the check. Apparently the images of checks taken with a Windows Phone 8 device are saved to your Pictures Hub. Not sure if it's a case that the images are sent to the Pictures Hub instead of transmitted to Chase but whatever the reason, it's preventing QuickDeposit from working properly.