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Settings > Call settings > Call forwarding. 
2.  Touch an option: Always forward, When busy, When 
unanswered, or When unreachable, to enable it.   
Other Options 
1.  Touch the Home key >    >    in the top search field > 
Settings > Call settings > Additional settings. 
2.  Touch Caller ID to choose if your number displays when 
someone receives your call 
3.  Check Call waiting to receive notification of incoming 
calls during a call. 
  NOTE: Contact your service provider to verify it the caller 
ID and call waiting features are available.