Guys please dont use this app for illegal use like spying on someone.this app is built for purpose that whats app account with same number can be used in more than one device.but some people pranks their friends to scan something and use this to spy on their whats app.i am saying this from my own experience even I did the same thing I wanted to spy the whatsapp account of my gf so I asked her mobile for some other reason and used this app to spy her whatsapp but when she came to know about this that was my worst feeling ever. so I advice you to use this app for the valid purpose only. it is the best app to use the same number in two devices. one disadvantage is that both scanned Mobile must turn on their internet or else this the nice app. I hope this helps. thank you. follow me if you liked it.