Electronic device for providing call function continuity and operating method thereof

An electronic device comprising:

• a first communication circuitry configured to support new radio (NR) communication;
• a second communication circuitry configured to support long-term evolution (LTE) communication;
• a third communication circuitry configured to support Wi-Fi communication;
• at least one processor including processing circuitry and operatively connected to the first communication circuitry, the second communication circuitry and the third communication circuitry;
• and
• memory storing instructions,
• wherein the instructions, when executed by the at least one processor, cause the electronic device to:
• register, via the first communication circuitry, with a network of the NR communication;
• connect, via the third communication circuitry, a call using the Wi-Fi communication with an external device while the electronic device is registered with the network of the NR communication;
• when the electronic device is registered with an IP multimedia subsystem (IMS) server via a network of the LTE communication and is connected to the call with the external device using the Wi-Fi communication, identify whether the electronic device has a call connection history associated with the network of the NR communication;
• and
• based on identifying that the electronic device does not have the call connection history associated with the network of the NR communication, deregister with the network of the NR communication and register, via the second communication circuitry, with the network of the LTE communication,
• wherein a search for a network of the NR communication is restricted based on the deregistration with the network of the NR communication.