To clear your browser cache and cookies, open your browser and press Menu - More - Settings.
Then select Clear Cache / Clear all cookie data / Clear history / Clear form data.
To change the screen brightness, start from the Homescreen and press Menu - Settings - Display - Brightness.
Then choose the desired brightness setting. You can also select Automatic brightness to let the phone decide for you
If you have auto-brightness enabled, you can also press and hold the notification bar at the top. Then move your finger left and right to adjust the screen brightness..
To show the Browser History, press the Star in the top right corner of the browser. Then press History.
This will only work in the standard Android browser.
If you have decided to ditch your iPhone in favour of Android, then there is a simple way to take your iTunes music, playlists and album art with you.
Simply go the Android Marketplace and download a Free App called Easy Phone Tunes. You will also need the computer version of the software, so go to http://easyphonetunes.com and download it from there.
Then, when that is done, turn your phone into a USB storage device (this will vary from device to device, but instructions are on the website).
Once your phone is connected to your computer, open the computer version of the software and select your device from the Easy Phone Tunes list. Then follow the instructions to Sync your media.
To view information about your battery and CPU go to your phone dialer and type in the following code: *#*#4636#*#*
To disable the screen lock, go into Settings - Location and security.
Then under Screen unlock settings press Change screen lock. Then chose None.
To bookmark a contact on your homescreen, long press on the home screen background and select Shortcuts. Then select Direct dial.
If you call someone regularly this can be useful as you will have a shortcut to them handily placed on your homescreen.
To allow swear words in voice recognition, go to Settings - Voice input & output - Voice recognition settings. Then untick Block offensive words.
By default, the phone will actually recognise swear words, but will insert x's instead of the word.
You can use the volume buttons to put the phone in silent mode.
Keep pressing the Down volume until it reaches 0%.
If you have 'Vibration in Silent mode' turned on, it will also put the phone into Vibrate mode. To change this, go to your homescreen. Press Menu - Settings - Sound - Vibration.
You can tether your computer or laptop to your phone so that the PC uses the phone's 3G or 4G connection.
To do this, connect the phone to your PC via USB cable. If a screen appears saying Choose a connection type, then select USB tethering and you should be able to start surfing straight away. If it doesn't then press the Home key to go into normal mode. Then go to Menu - Settings - Wireless and network - Tethering and portable hotspots. Then tick USB tethering. Your computer should then install the relevant drivers. To test, simply open your browser and start surfing.
Another alternative if the above doesn't work is to use an App called PdaNet. Before you install this App, you will need to go to Menu - Settings - Applications - Development. Then tick the option which says USB Debugging. Then download both the App and the software for your computer. Once they are both installed run PdaNet on your laptop and then on your phone. Follow any other instructions to complete the process.
Warning: Some carriers will tell you that tethering is not allowed in their contract. You should still be able to use the above techniques, but be aware that your carrier may not be happy. Also, if you are not on an unlimited data plan, be sure you do not use too much data through your laptop or computer as you may incur extra charges.