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There are various secret menus hidden in the Android OS. Here are some of them (thanks to askvg.com):

Aptoide is like a package manager for Android. It retrieves lists of programs from different repositories and lets you install, update or uninstall these programs.

To add custom sounds to your Android phone, create the following folders on your SD-card:

Android 2.2 (Codename: Frozen Yoghurt) brings a new feature which allows moving apps to the SD card. Unfortunately this only works for apps which bring a flag to allow this, i.e. not for the current versions.

To manually update the firmware, put the new firmware named as update.zip onto the root directory of the microSD card. Then do this: (found at androidspin.com)

If you want to sync your iPhone primarily with an Exchange server of your company but do want to have your (private) Google Calendars with you, you can add them as CalDAV calendars (since iPhone OS 3.0).