So if you joined a network in the past and trusted its certificate while at it, and saved it on your iPhone/iPad.
Sometime later, if either:
- It’s the same network but their previous certificate has expired and they’re now using a new one
- Your device finds another network with the same SSID, which does not have the same certificate (has no certificate or has a different certificate)
Will your iPhone/iPad alert you or will it quietly join without asking you about anything?