Fiori by default is multichannel so Fiori apps are already mobile ready through a browser. There are native/hybrid mobile apps that use SAP BTP mobile services using Mobile Development Kit, iOS BTP SDK, Android BTP SDK, and Kapsel, but these all require the use of mobile services. There are various Blogs available https://blogs.sap.com/ that provide examples, as well as, SAP tutorials. There are also products like SAP Mobile Start and SAP Workzone that enable the enterprise through mobile.
If you have a specific question about one of these technologies after reviewing the available blogs and product pages, please feel free to ask separately on https://answers.sap.com/index.html.
-Kevin
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