isai VL LGV31 is an Android smartphone developed by LG Electronics for the Japanese market with the carrier au. It launched 12 December 2014 as a successor to the isai FL LGL24.

au announced on 4 June 2015 that the LGV31 was one of ten au models planned to receive an upgrade to Android 5.0.^[1]

• Akihabara News staff (2014-10-27). "au - isai VL LGV31 - 2014 winter 5.5-inch isai smartphone". Akihabara News. Archived from the original on 2015-07-12. Retrieved 2015-07-11.
• Ōta, Ryōzō; Kawasaki, Emi (2014-10-27). "「au VoLTE」対応、5.5インチWQHD画面の「isai VL LGV31」". Keitai Watch (in Japanese). {{cite web}}: Missing or empty |url= (help)
• Tsubasa (2014-12-12). "フルHD超え文句なしの高スペック『isai VL LGV31』レビュー". Shūkan ASCII [ja] (in Japanese). {{cite web}}: Missing or empty |url= (help)