- Go to http://m.google.com/sync on safari.
- If you see the error message something like "Sorry Google Sync doesn't support your current mobile ....",
- Click the link "Language Change" ( The word "Language Change" could depend on your configuration. In korean, "언어 변경"
- Click "English (US)"
- You can see your device list. Click "iphone" and select calenders which you want to sync with iphone4.