While on call, typing a digit on dial pad doesn't make any sound

It is good to know that the problem has been resolved. After my suggestions including "cheat code" did not fix the problem yesterday, I discussed this with a Samsung ROM developer. You may like to consider options based on this discussion.

Firstly, the tones which failed are DTMF tones. These are NOT

• User configurable


• Affected by app misbehaviour


• Custom ROM developers also do not tinker with this as it is a deep feature and they don't need to tweak it for user benefit


• Stock ROMs/ upgrades will NOT disable it

As to how this happened is a mystery, but there is always an annoying possibility, that this may occur again. You have three options

1. Do nothing: If it happens again you can try using these kind of apps (bunch of them on Play Store, Google for "DTMF") DTMF Tone Generator

Any of next two options recommended

• Device not rooted

  
  
  
  
  
  • Take backup using Kies
  
  
  • Factory reset
  
  
  • Do firmware upgrade/restore using Kies
  
  
  • Restore data using Kies
  
  

Or see this for other ways of taking back up Full Backup of non-rooted devices

• Device rooted

  
  
  
  
  
  • Take nandroid backup using custom recovery backup
  
  
  • Factory reset
  
  

  • Flash upgraded Stock ROM

    
    
    
    
    
    • Can be downloaded from Sammobile after registration. Make sure you download the correct version and of your region
    
    
    • Flash stock using Odin
    
    
  
  



• Restore data from nandroid backuo