By Ludek, one investigative user:
You can try enter some internal URL in your WAP browser.
Hundred of similar internal addresses exists in UP.browser:

• device:mt
• device:key-exch
• device:outbox
• device:outbox/almost
• device:outbox/full
• device:channels
• device:status?x=s
• internal:home-edit
• internal:register
• internal:register-s
• internal:security
• internal:insecure
• internal:suck-url
• internal:help

Really - every item in menu and every browser message has it's internal URL. You can test it with @Menu/Navigation/Show URL item. This is, why browser menu acts like html pages (stored to history). You can try it on other phones with UP.browser - Siemens, Motorola, Alcatel (tested on  OT501).

But following bug of FW1804 isn't Easter-egg. Try select on C35i other language than english, for example cestina. After this switch phone off and on again. Then activate intentionally not filled wap-profile. You must see something like this:

Now select like language English and go to Internet. In main menu text of item [1 Home] is missing, right dialog key has permanently assigned function @Menu and isn't impossible switch it to function Menu or OK. So you can go to @Menu only, but in this menu are some next items missing also.

For correction you must switch off and on all the phone.