In order to meet evolving security demands, SAP Single Sign-On 2.0 (since SP4) supports single sign-on from mobile devices. The solution is based on time-based one-time passwords (TOTP) generated by the SAP Authenticator mobile app. The SAP Authenticator mobile app is available for both iOS and Android, and supports the IETF standard RFC 6238.
More information:
Simple and Secure Mobile Single Sign-On with SAP Authenticator
Mobile Single Sign-On for SAP Fiori with SAP Authenticator
Configuring SAP Fiori Client for Single Sign-On with iOS SAP Authenticator
Configuring SAP Fiori Client for Single Sign-On with Android SAP Authenticator