how can we clear whatsapp conversations in our contacts I have a doubt on whatsapp msgs.my frd msg me on whatsapp I seen the whole coversation.on the next day I didn't find any conversation in my phone.I face this situation from couple of my frds.Is it possible to delete the conversations from other cells reply me quickly.
The WhatsApp FAQ has instructions that should help you:


  To delete a single message from a conversation:
  
  Open WhatsApp and go to the chat window with the message you want to
  delete. Highlight the message. Press the 'del' key on your keyboard.
  
  To delete an individual or group chat:
  
  In the  Chats screen, highlight the chat you wish to delete. Press the
  button and select Delete chat or Delete and Exit Group.
  
  To delete your entire chat history and remove yourself from all groups:
  
  Go to WhatsApp >  Settings. Scroll to the bottom and select  Advanced
  Settings. Press the  button and select Delete Chat History.
  
  NOTE: Using Delete Chat History will delete all chats from the Chats screen, as well as remove yourself from all groups.
  
  To delete all messages in a conversation without closing the chat window or leaving the group
  
  Open the chat. Press the  button and select Clear conversation.
  
  To clear all chat history, but continue to participate in groups:
  
  Go to WhatsApp >  Settings. Scroll to the bottom and select  Advanced
  Settings. Press the  button and select Clear All Chats.
  
  NOTE: Using Clear All Chats will not remove you from any groups.