Page 1 of Sim switching with Nokia

I`ve got a dual sim in my phone, and was told I could switch between the two using a code. Does anyone know how, as I didn`t get any instructions with the thing? :D Phone is a 3310. At the mo I have to turn it off and on every time I want to switch, which is a pain.

the code you need is

*3370#

then it changes to your other network

:D

Thanks, that works a treat! :)