How can I type in different languages / turn on International keyboards?

The iPhone supports many different keyboard characters from around the world. To turn on one or more International keyboard(s):

1. Touch Settings -> General -> International -> Keyboards
2. Turn ON the keyboards you wish to use
3. When multiple keyboards are switched on, a globe symbol appears to the left of the space bar in the keyboard. Use this button to switch between International keyboards when typing.
4. Many keyboards have additional hidden keys. To access these characters hold down a key on the keyboard and variations of that letter will appear. For example, holding down the letter E on the English (US) keyboard brings up 8 different options.

The iPhone has built-in keyboard support for the following:

English (U.S.)
English (UK)
French (France)
French (Canadian)
French (Switzerland)
German
Traditional Chinese (Handwriting, Pinyin, Zhuyin)
Simplified Chinese (Handwriting, Pinyin)
Dutch
Italian
Spanish
Portuguese (Brazil)
Portuguese (Portugal)
Danish
Swedish
Finnish
Norwegian
Korean
Japanese (QWERTY)
Japanese (Kana)
Russian
Polish
Turkish
Ukrainian
Estonian
Hungarian
Icelandic
Lithuanian
Latvian
Flemish
Arabic
Thai
Czech
Greek
Hebrew
Indonesian
Malay
Romanian
Slovak
Croatian
Bulgarian
Serbian