Sidekick™ Platform 
The Sidekick™ fuels the social and communication passions of T-Mobile customers. Sidekick users are a very loyal and vibrant group. With a unique form factor and a passionate user base, the possibilities for creating groundbreaking new applications are endless.
All Sidekicks currently available for sale from T-Mobile can run applications built on the Java ME platform.
Please note, the devPartner program is not currently accepting Sidekick applications. To get started developing applications on the Sidekick platform, visit Danger’s Developer Zone to download the Danger® SDK and to sign up for a developer key. The SDK contains a device emulator, OS libraries, proprietary tools and some sample applications.