How to free up storage in android oreo and ios-11
Android-Oreo
Android Oreo comes with a feature called Smart storage. It automatically deletes images and video files which have been backed up on Google Drive after 30 days. To take advantage of this, go to 
Settings->Storage-> and switch on Smart storage.Android OS offers lots of other options when it comes to making room. The simplest one is to go the phone’s Settings->Storage->Cached data and
and select clear data.
Settings->Storage-> and switch on Smart storage.Android OS offers lots of other options when it comes to making room. The simplest one is to go the phone’s Settings->Storage->Cached data andand select clear data.
You can likewise free up space with outsider applications, for example, CCleaner or Clean ace. They can distinguish all the reserved documents for you and erase every one of them with one tap.
iOS-11
The most recent (iOS 11) rendition of Apple's versatile OS is at long last being taken off to clients. It requires no less than 4GB of space. On the off chance that you are utilizing a 16GB or 32GB variation of the iPhone, the new stockpiling related highlights of iOS 11 can offer assistance.
So in the event that you go to Settings->General-> Storage, you will see two new alternatives, Offload unused applications and Review extensive connections.
The previous enables clients to erase capacity documents of an application that they don't utilize all the time without evacuating the spared records. So whenever they introduce the application or diversion, the spared document will be accessible.
The last enables clients to distinguish and erase substantial messages with photographs, recordings or some other connection.
In the event that your message box fills quicker than others, the message application has an alternative which enables clients to consequently erase more established messages following 30 days. You can get to it in Settings->Messages-> Message history.
The latest version of Android and Apple’s iOS offer some nifty features which can come in handy if your smartphone’s storage is filling up faster than you want.
Mobile apps are designed to create and save temporary files, also called cache data, on the smartphone so they will load faster the next time you open them.
A considerable measure of cell phones accompany a record supervisor application which can enable clients to perceive how much space a document is possessing. It can likewise help clients by recognizing and erasing reserve documents physically.