If you have already synchronized Google Calendar with your Bitrix24, you can view events on your mobile device.
Install the Google Calendar app for Android or for iOS.
It is also possible to use Google Calendar via browser on your mobile device.
Open the mobile app and select/add Google account synchronized with Bitrix24.
After that, all events in the Bitrix24 calendar will be automatically synchronized in the mobile version of Google Calendar.
You can find more detailed instructions about Google Calendar connection on the official website.