Calling Symbols
You can assign a Calling Symbols to phonebook entries in your C35i. You can choose from 10 icons:

Calling Pictures

But why exists five hidden unusable Calling Symbols in C35i firmware? I don't know.

Inaccessible Calling Pictures

Don't worry, assemble (with method by dr.Frankenstein) something like bizard rogues' gallery from so called Calling Faces! Can you identify everybody from twenty-seven your friends?

Programmer's jokes

download?MMI-Team's Easter-egg
If you want stylish operator logo, click on this picture for download. And why is stylish? Go into Phonebook, select <New Entry>, to <Phone> write 2000 and to <Name> write History. Then press OK.

VIP Phonebook
Press twice to open the VIP Phonebook. Okay. But why isn't it available for SMS sending? Sorry.

Check Space
We can check total and available capacity for lists:
 SM,   FD  and  ME ... okay
But ME list is displayed one more time, now with icon  and information about ME items without assigmented Calling Symbol. New user is mystificated supposing, that 2x 100 items exists in ME phonebook.
In accordance with this philosophy we can say, that pseudocapacity for VIP list is
 =  +  +   :-)
And incidentally - icon for voice dialing  exists in fw too.

Question mark in number
If you dial number containing question mark, you must modify it before connecting. It is very useful function, but you cannot insert question mark using keyboards of C35i. You must to use some good program - for example top cardware Sx35CZ.