An operating method of an electronic device including at least two multiple Subscriber Identity Module (SIM) cards, includes receiving a call to a phone number assigned to a second SIM card during a call to a phone number assigned to a first SIM card among the multiple SIM cards, checking a call forwarding order fixed between the multiple SIM cards, and forwarding the call to the second SIM card phone number, to the first SIM card phone number according to the fixed order.