Telephony manager, which is part of the Android application framework, provides a telephony API to user applications. It consists of the android.telephony and android.telephony.gsm Java packages.

Java development frameworks can help developers get an application up and running faster, offering code reuse and eliminating the task of building boilerplate code.

Here, Android provides a substantial subset of the Java 5 Standard Edition packages, including Collections, I/O, and so forth. The next level up is the Application Framework layer.