wifi didnot on at 5 am recently when i change iphone
how change setting to old one which was my wifi on automatically at 5am in the morning but not now
There is no such setting, and never has been. And unless the phone is plugged in, the phone will turn off Wi-Fi when the screen is locked.
The closest setting is if you disable Wi-Fi for your current network and location by tapping the Wi-Fi button in the Control Center Wi-Fi will turn back on at 7AM the next day.