Methods of hacking what's app

Method 1:
This will change every group, account info and settings. Your old number will no longer become admin.
1. open whatsapp
2. go to settings (whatsapp setting)
3. go to account
4. go to change number (if you did not see  this, you are using the old whatsapp. please update your whatsapp first)
5. follow the instruction given
6. voila. the new numbers will become just like yours.
Method 2:
This method will be a little bit difficult but you can choose to change only one group or
2, 3 and so forth.
1. backup whatsapp message using Titanium Backup (do this if you want to save the group message)
2. open whatsapp
3. open the group you want to change
4. tap the group name (in order to add the new number)
5. on the right side, tab the icon to add new  contact in the group
6. add the number you wish to make admin
*do step 4 to 6 if you have not add the number you want to make admin
7. remember who is in the group or take screenshot (this will be useful later)
8. remove all other members until two members left (you and the new number)
9. tap delete and exit group (at this point the  new number will become the admin)
10. using the new number, add all the members of the group as before (you can refer to the screenshot you take in step 7)
Method 3
This method was introduce in whatsapp in November 2014. It enables the admin to add another user as an admin.
1. open whatsapp.
2. go to group info
3. long press the user that you want o add as admin
4. done if you dont want to be an admin at all follow below after you have follow the above instruction.
5. leave group
6. ask the person who you have assign as an admin to add you back in the group. Thats all. Thank you.