You can pull your respective operator logos on your Nokia mobile screens.

For MOBILINK GSM logo:
Send command "MLOGO" to 300
My Logo:
Create your very own logos
send MYLOGO <style> <text> to 300
style = 1..34,i,b,r
1..34 = font number
b=bold
i=italic
r=reverse
e.g MYLOGO 3bi Ahmad
Other Logos:
You can pull other logos by sending OPLOGO (space)
<logo number> send to 300
Example: OPLOGO 1148