General handset limitations

Page size limit (non-flash)
- 48 KB for (some?) Softbank 3G
- 100 KB should be considered the absolute upper limit
Image size limit
SSL limits
Redirection limits
- usually after 6-7 HTTP redirects, the phone will quit and display an error. This can bite you when doing carrier billing!
Cookie limits
- docomo 1.0 browser does not support cookies
Javascript support
- docomo 1.0 browser does not support javascript
Pages cannot be saved in pure Unicode.