Solution 3: Delete Useless Apps and Data 1 out of 4 mobile apps are never used after the first time. You will have many apps stored in the internal storage that you don't use anymore. Go ahead and uninstall them to free up internal memory. Here is a guide telling you how to delete Android apps.
Solution 4: Clear App Data and Cache Apps store cache files and other offline data in the Android internal memory. You can clean up the cache and the data in order to get more space. But deleting data of some apps may cause it to malfunction or crash. Also, the offline files may not be available anymore. To clean your app cache head right over to Settings, navigate to Apps and select the app you want. Now select Storage and tap on Clear Cache to erase cached files. You can also clear app data from the same page if you wish to.