Available on Google Android and iOS. We had tested the solution back in the fall of 2015 when it was just out :

SAP Fiori on your phone in 6 Steps

9 months later it seems to be well graded by the community with an average 4 stars by 348 users.

https://play.google.com/store/apps/details?id=com.sap.fiori.client&hl=en

So why use it, in short  :

• Better performance through enhanced cache management
• Its a native mobile application runtime container for SAP Fiori.
• Can be downloaded from the public app stores for iOS, Android, and Windows devices.
• Use of mobile qualities: barcode scanner, camera, geolocation
  (Note: contacts, calendar, data storage, notifications, notes, tasks, and audio are not covered in the current release)
• Developers can use the SAP Mobile Platform SDK to build a custom SAP Fiori client for iOS and Android.

• Use of an app passcode to meet security requirements: This passcode may be enforced by an administrator or set individually
• Full screen mode for all mobile devices
• Easier onboarding with URL or email (with SAP Mobile Secure)
• Integration with Security providers such as Mocana and Keytalk.