If the message I sent to someone on WhatsApp is later than her last seen, how could the message be seen, as it is shown by double tick sign?
On WhatsApp, I can see my friend's last seen on 20/05/15 at 14:15. I can't see him online so I sent him a message only had 1 tick and his last seen did not update. I spoke to him and he said he's not got my messages. What could it be?