Why won't my wifi connect?

I've been trying to connect to the local Arby's wifi that does not have a password or sign in, and the signal is strong but it just keeps saying "AP currently not in use. Connection not strong" or something like that. I have a galaxy s5 if that matters, but my sister has the same phone and it works for her. Help?

Anonymous2017-01-15T10:34:37Z

Arbys Wifi

Anonymous2014-12-19T08:06:31Z

You can ask the employees.