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 ca n'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 ?