how2replace

Hi FRiends.... I've NOKIA 3230 and i know only one thing about this that its Series 60 phone. Can anyone explain me whats this S-60?? ((1)) How can i find that which OS and Edition my set has? My phone version is this: V 5.0614.0 22-03-06 RM-51 ((2)) I want to change FONT of my phone to...