Thanks, I did take a look at that, and no encryption at all isn’t one of the options. In any case, I don’t really see that as a sensible way to connect.
I did have a random connection successes when trying different wireless standards, so 11n instead of mixed n and g.
@Gimli do what @alzhao told you. Newer phones can refuse to connect if the wifi security is too low, or if you have changed the setting in the phone also. Change to WPA2.