Try doing a Hard Reset
Hold the Home button and the Power button until the white Apple logo comes up on screen. Then release the buttons.
REMEMBER! Hold the buttons until you get to the Apple logo. Do not let them go when the "swipe to turn off screen" comes up or when the screen goes black… Wait for the white Apple logo then release the buttons.
Turn cellular data off in settings on the iPhone but keep wifi on.
Just because the icon does not appear doesnt actually mean its not connected
As long as you have a tick next to the network in the iPhone... and the IP address is not 169.254.XXX