Nokia X2-02 is dual standby or dual active?

is Nokia X2-02 dual standby? if not...is it both of the simcard can work simultaneously?

Its a dual-standby (not dual-SIM dual-active) device, which means there's only one radio module. Having only one transceiver means that if you're on a call or use the internet on the first SIM card, the second SIM is inactive for all that period.