sso means you login once, then you can access different resources without login repeatedly.
Depends on what you want to achieve, the implementation is different.
A common use case/scenario is that you login to your company domain once, then you don't need to login again to your internal email, internal IM, internal website, etc. that how CA product "CA Single Sign-On " can help here.
If you are talking about login once on your device, then you can access a bunch of apps (based on gateway), then the MAG/MAS sdk can help you -- Mobile Single Sign-On Policies - CA Mobile API Gateway - 4.1 - CA Technologies Documentation