Microsoft Dynamics Field Service Mobile (2020) built their own model driven App based on PowerApps. I don't need to recall you how this apps is usefull for our customer doing service and maintenance.
Field Service (Dynamics 365) is a mobile app designed and optimized for technicians to view Dynamics 365 Field Service work orders, customer assets, accounts, and contacts. Different than Field Service Mobile (see feature comparison below), this alternative mobile app is built on Microsoft's Power Platform as a model-driven app and is customizable to your business needs with the same admin console as all Dynamics 365 business apps.
Available natively for Apple iOS and Google Android phones, Field Service (Dynamics 365) offers technicians many capabilities they need to perform onsite customer service, such as:
A calendar view of assigned jobs
Support for picture, video, and asset barcode scanning
Customer signature capture
Offline capabilities so technicians can continue viewing and recording work in areas without internet
Feature comparison: Field Service (Dynamics 365) versus Field Service Mobile
Display comparaison : Field Services Mobile / Field Service Dynamics 365
Install the apps Field Service (Dynamics 365)
Go to the app store on your iOS or Android device and search for Field Service mobile.
Download the app called Field Service (Dynamics 365), as seen in the following screenshot. This is the mobile app built on the Power Platform.
For Prerequisites, follow this link : https://docs.microsoft.com/en-us/dynamics365/field-service/mobile-2020-power-platform