ENISA launched a smartphone guidelines tool with the following subjects: – Ensure correct usage of biometric sensors and secure hardware; – Secure data integration with third party code;
– Implement user authentication, authorization and session management correctly; 
– Ensure sensitive data is protected in transit; 
– Consent and privacy protection; 
– Protect paid resources; 
– Secure the backend services and the platform server and APIs; 
– Identify and protect sensitive data on the mobile device; 
– Protect the application from client side injections; 
– Secure software distribution; 
– Check device and application integrity; 
– Handle runtime code interpretation correctly; 
– Handle authentication and authorization factors securely on the device. 
Read more about this topic at: https://www.enisa.europa.eu/topics/iot-and-smart-infrastructures/smartphone-guidelines-tool