7.2. Phone or not?

Starting with version 2.1 of the Android OS, devices no longer need to support telephony features. Expect more and more non-phone devices to reach the market, such as set-top boxes, auto devices, and certain tablets. If you want to reach the largest possible market with your app, you should include telephony features but fail gracefully if they’re not available. If your application makes sense only when running on a phone, go ahead and use any phone features you require.

If your application requires telephony to function, you should add the following declaration to your AndroidManifest.xml: