# Android · Rain Wiki

> Storage, battery, connectivity and security settings on Android phones.

- [Android version and security patch level](https://raincleaner.eu/wiki/android/android-version): How to see which Android version and security patch your phone has, how to update, and why the patch date matters.
- [App cache vs app data on Android](https://raincleaner.eu/wiki/android/cache-vs-data): The difference between Clear cache and Clear storage (data) on Android, what each removes and when to use which.
- [App permissions on Android](https://raincleaner.eu/wiki/android/app-permissions): How Android runtime permissions work, how to review them per app or per permission, and what 'only while using the app' means.
- [Battery Saver and Adaptive Battery](https://raincleaner.eu/wiki/android/battery-saver): What Android's Battery Saver and Adaptive Battery do, what they limit, and how to check which apps use the most battery.
- [Developer options and USB debugging](https://raincleaner.eu/wiki/android/developer-options): How to turn on Android developer options, what USB debugging allows, and why to switch it off when you do not need it.
- [Factory reset on Android](https://raincleaner.eu/wiki/android/factory-reset): What an Android factory reset erases, what to back up first, and how factory reset protection asks for your Google account afterwards.
- [Find Hub (formerly Find My Device)](https://raincleaner.eu/wiki/android/find-hub): How Google's Find Hub locates, rings, secures or erases a lost Android phone, and what must be turned on in advance.
- [Freeing up storage on Android](https://raincleaner.eu/wiki/android/free-up-storage): Where Android storage goes, the built-in ways to free space, and what to check before deleting photos, downloads or apps.
- [Safe mode on Android](https://raincleaner.eu/wiki/android/safe-mode): What Android safe mode is, how to start it on Pixel, Samsung and other phones, and how to use it to find a problem app.
- [USB tethering on Android](https://raincleaner.eu/wiki/android/usb-tethering): How to share an Android phone's mobile data with a computer over a USB cable, with the menu paths on Pixel, Samsung, Xiaomi and Huawei.