How to redirect a call from one number to other in android

Question

How to redirect calls from one number to another in android. (Ex: if first number is switched off then how to switch a call to another number of a same person)

Answer 1

String callForwardString = "**21*1234567890#";    
Intent intentCallForward = new Intent(Intent.ACTION_DIAL); // ACTION_CALL                               
Uri uri2 = Uri.fromParts("tel", callForwardString, "#"); 
intentCallForward.setData(uri2);                                
startActivity(intentCallForward); 

This is what u might be looking for. However, this will work for GSM only. Also you need to try on actual handset, not sure whether it will work on Emulator