We can secretly read Whatsapp Messages and the sender will not be able to know this
How to do this?
1) Turn on the flight mode of your mobile.
2) Then, read the WhatsApp message.
3) After reading is completed, turn off the flight mode again.
4) The sender will not be able to notice any blue ticks
5) The senderwill assume that you had not read his/her WhatsApp message.