Just phones no PC...
ONLY 10 STEPS
1:Have both your phone and the phone u intend to spy on.
2:On your phone,open google chrome browser.
3:Tap on your chrome options and check the box marked: Request Desktop site
4:Type "WhatsApp web" on the search box, the browser should still be on desktop site mode
5:It should open the Whatsap web page the same way a PC opens the site
6:It will display a whatsapp QR code and ask you to scan it.
Now take the target phone .
7:Open the target's whatsapp application.
8:On his/her whatsapp,go to options then whatsapp web
9:It will open the camera and display a QR code scanner.
10:Assuming you had not closed the whatsapp web desktop site on your phone and that the QR code is still displayed there,,use the TARGET phone to scan the QR code..
Upon a successful scan,boom! the target's whatsapp account should be displayed on your phone.
Now you can sneak back and return the target's phone to where you took it .
SUCCESS!! For the trick to work,the victims data must be On