Thanks, but I already knew about the Mac side. I was hoping for a way to do the equivalent on iOS. We have two networks, and iOS usually grabs the one we don't want first, so we have to keep manually switching it.On a Mac open System Preferences, click Network, click Wi-Fi, then click the Advanced button. In the list of Preferred Networks you can drag them to the order you want them to connected. For example I have my 5GHz network at the top of the list and the 2.4GHz below it.
iOS isn't so easy. Apparently you can do it with a Configuration Profile. Also read this Apple article: How iOS decides which wireless network to auto-join.