It is strongly recommended to only use APIs and methods which are classified as PublishedAll. To ensure that your application will work also in future platform releases, using PublishedAll classified APIs and methods is the safest way.
If APIs and methods with other classifications are used (which is strongly discouraged), your application might stop working in future platform versions without any notification from Symbian about deprecation, removal or modification of internal or published partner classified APIs and methods.
S60 C++ APIs do not follow the same classification system as Symbian APIs. However, APIs and methods marked as deprecated should not be used, since in future platform versions such APIs and methods might be removed.