I was amazed that very few people know how to turn auto-correction off. Here is what you need:

  • Jailbreak your iPhone and install Cydia
  • Install BossPrefs
  • Install CToggle BossPrefs Addon
  • Run BossPrefs and turn auto-correction off

There is even a domain: http://please-let-us-disable-autocorrection-steve.com.. Nice.