Thanks for your question. Have you tried our Huawei Honor Silver Cell Phone Case yet? Here's the link to some of our cases along with a few third-party recommendations. https://www.amazon.com/Huawei-Cell-Phone-Case-Honor/dp/B01K5FSAF6

To change which calendar opens by default from the notification shade, please call into our Customer Service team at +1-844-524-6667, so we can get more details as to which type of calendar app you are using. We appreciate your patience!