Android
package

android.telephony

Classes

CellLocation Abstract class that represents the location of the device. Currently the only subclass is GsmCellLocation.  
PhoneNumberFormattingTextWatcher Watches an TextView and if a phone number is entered will format it using formatNumber(Editable, int)  
PhoneNumberUtils Various utilities for dealing with phone number strings. 
PhoneStateListener Class used to listen for changes in the phone state, including the service state, signal strength, message waiting (voicemail) indicator, etc. 
ServiceState Contains phone state and service related information. 
TelephonyManager Access the state of the phone radio. 
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