접두사 전화 번호에 #를 추가하고 연락처에 보조 전화 번호로 저장
Add # to prefix phone number and save as secondary phone number in contact.
For example:
Contact abc has one number only 088 088 0888
Using your app, you can create a second number for the same contact but prefixing it with a #. Then Contact Abc has 2 numbers 088 088 0888 and #088 088 0888