All the mobile providers allow settings to be stored in an application with their own systems. There is nothing wrong with this, and it works well. The issue with any PCL-based application is that you need to write some form of wrapper around the storage code for entry and retrieval, which also means that you need to know how to use these storage systems.
In this chapter, we will examine:
How the platforms store their settings
How to construct an interface for these storage systems
How to create a unified settings portable class