SIM Manager, the utility with which we can transfer contacts from our address book to a SIM card, was recently updated to version 2.3 which brings compatibility with iPhone 4. SIManager is one of the few, if not the only, utilities that allows iDevices users to transfer contacts from the terminal on a SIM card. There is no such function in iOS, although most terminals available on the market allow users to do this operation. SIManager is very easy to use, but be careful with it because it does not always transfer contacts correctly.
SIManager 2.3 is available for free in Cydia. It is possible that it will not appear in the repo yet, Cydia has functionality problems at the moment.
