I have an LTE iPad Mini 4 that I carry with me. At work, we don't get a good LTE signal so I have my iPhone connected to our guest wireless network. It does not require a password. I noticed that the Mini was also on the wireless even though I didn't remember connecting it. So I told the Mini to forget the network. A little later, I notice it is on the wireless again. I thought that if I told it to forget the network it would no longer be considered a known network & would not join without asking (I have Ask to Join Networks on). Is this not the case?