How to Determine if Android Device has Telephony Support

public static final String FEATURE_TELEPHONY was added in API level 7
The device has a telephony radio with data communication support.
Constant Value: "android.hardware.telephony"

1. Get a PackageManager Instance named myPackageManager.

2. Create a Boolean Variable named bolTelephonySupported. 

3. Set the Minimum and Target SDK version  to 7 or greater. 

4. In the onCreate method, add the below code. This will return the telephony ability to a boolean named bolTelephonySupported. It will then display a toast displaying the telephony ability of the device to the user.

bolTelephonySupported = myPackageManager.hasSystemFeature(PackageManager.FEATURE_TELEPHONY);

if (bolTelephonySupported) {

Toast.makeText(this, "Device has Telephony capability", Toast.LENGTH_LONG).show();

} else {

Toast.makeText(this, "No Telephony capability!", Toast.LENGTH_LONG).show();

}

5. Compile and run!

Resources:
- Professional Android 4 Application Development by Reto Meier, pg 702

- http://developer.android.com/reference/android/content/pm/PackageManager.html#FEATURE_TELEPHONY