Wifi no longer working in restaurant

I have been using the wifi from a restaurant with no problems for abput a year but a few days ago it stopped working.A few seconds after I fired up my macbook air a blue screen would appear asking for the password which I would supply & be connected.Now I do not get the screen asking for a password & there is no connection. I have changed no settings on my computer & there seems to have been no change with the restaurant wifi because other people get access with no problem.One odd thing I did notice when I tried using the network assistant is that next to the name of the wifi under the 'security' heading it states 'none' whereas there obviosly was & is.
My computer connects with no issues to my home wifi.
Any help or suggestions will be greatly appreciated

First, try to reset the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again. You will not lose data by resetting.
If this does not help, set it up as new device, explained here:
How to erase your iOS device and then set it up as a new device or restore it from backups
If still no luck, get it checked by visiting an Authorized Apple Service Provider or contact Apple Support to get it serviced:
iPhone - Contact Support - Apple Support

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