iphone 6 8.4 wifi no longer works

I have a iphone 6 and I have updated to 8.4 and my wifi no longer works, it shows I am in range (full bars) but I cant seem to connect to any websites or apps at all its like I have no internet but I am using other devices on wifi just fine (windows phone, samsung galaxy s3, imac 27")

Anyone got any tips to fix this? I have tried rebooting the phone but it didnt fix it.