Go to the App Store (iOS) or Google Play Store (Android), search for Microsoft Dynamics 365 Business Central.
Google Play Store: https://play.google.com/store/apps/details?id=com.microsoft.dynamics.ProjectMadeira&hl=en_ZA&gl=US
Apple App Store: https://apps.apple.com/us/app/dynamics-365-business-central/id1093325047
After completing the installation, follow the below steps to get connected to BC:
Run the app, then select "Advanced Options"
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Select "On-Premises"
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Insert your Service Name (the URL that you normally use to log into BC), then tap the right pointing arrow to continue
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Insert your username and password, tap the right pointing arrow to log in.
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Once logged in, you can then use BC
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