Transfer contacts from a nokia s60 phone to s40 symbian phone

Anyone may have to transfer the contacts from one phone to another phone, if your old phone is malfunctioning or in a case when you may want to change the mobile phone model.
Latter is the case is with me as I want to change my mobile phone fromNokia 6600 to Nokia 5310.So ,now for transferring the contacts from nokia 6600 to nokia 5310 I searched almost every method and software but, still none of the software work for me as both of the above phones have a different base operating system.