According to various embodiments, an operating method of an electronic device may provided, and the operating method may comprise determining initiation of a voice call on a first Subscriber Identity Module (SIM), while availing first data services through the first SIM, wherein the initiation of a voice call leads to a fallback from a first Radio Access Technology (RAT), wherein a Default Data Subscription/Service (DDS) is set to the first SIM, registering with a first network through a second SIM, in response to determining the second SIM is registered with a second network with a second RAT, and availing the first data services from the second SIM that is registered with the first network, while engaging in the voice call on the first SIM. Other various embodiments may be possible.