Amazing feature suddenly popped up asking zip the apps you don't use to save space. I foolishly selected all and it took long time to zip them. Basically it locks those apps and make them useless. Then some of them like Telegram, Samsung members, etc are unable to unzip. If you unzip them, those apps are reset. Basically you have to reinstall the apps and your settings are gone, such as Microsoft swift key etc. I regret buying Samsung phone and will reduce my rating from 2 to 1 on amazon.
