U+번호안내 서비스 is a supplementary app for using some features when using the 'Numbering Service' provided by LG Electronics' address book. It is only compatible with LG Electronics terminals released after June '17. It can be used to update the information service of the number guide service and improve bugs, but it is not actually exposed on the mobile phone. This app is available only for updates and is not for general use.

The app provides two main functions: Interactive Search and Homepage. Using the address book search window, users can search for a reciprocal phone number. Detailed information is provided through the following cacao, BC card, and 114 data combination. Additionally, the frequently called entities are categorized by the Homepage feature. Only key information such as business hours, phone numbers, etc. is displayed. This app is supported by LG Electronics terminals released since June of '17, including G6, X500, Q6, Q8, V30, X401, X415, V35, and G7.