013LTELTE톡 is a communication app that allows users to make and receive phone calls using a Wi-Fi connection, even without a phone plan. Users can obtain a phone number from a local agency and use it to make calls and receive calls in Wi-Fi areas. The app utilizes several system functions to ensure smooth communication, such as checking network status, using the address book for call history, and utilizing Google services for push notifications.

For travelers going abroad, 013LTELTE톡 is highly recommended as an alternative to expensive roaming services. Instead of using costly data roaming, users can rent a pocket Wi-Fi or purchase a prepaid SIM card in the destination country, disable mobile data on their phones, and receive calls through 013LTELTE톡. Text messages can also be sent through the app using the 013LTE number. If users wish to receive calls, they can forward calls to their assigned 0130 number, which allows them to receive calls for free on their personal 010 number. However, it's important to note that only voice calls can be received, and additional setup may be required to activate call forwarding.

In terms of call quality, 013LTELTE톡 provides the best sound quality when making calls within Korea, followed by making and receiving calls from overseas to Korea. When making calls within the same 013LTELTE톡 network, calls are free, but the sound quality may not be guaranteed. When receiving calls from local numbers in countries with free international calling, there is no charge. For users traveling to the US or China, it is recommended to use a local SIM card or purchase a local SIM card for better call reception. Within the app, users can input the local country code and number for call reception in the destination country.