DePersistWifi tweak available at the Cydia Store turns automatically turns off wifi and push notifications when your device goes to sleep and turns them back on when you unlock your device. The tweak places an icon on your springboard that allows you to toggle wifi and push notification sleep options on and off. The tweak does not require any effort from your side and is very simple to use.
DePersistWifi tweak for iPhone is available at the Cydia Store for free under Modmyi repo. You need a jailbroken device to install this tweak
To download this tweak
Open Cydia and Click on Search
Type ‘DePersistWifi’ in the search bar
Click on it and hit install