LG G3, G4, G4 Stylus and Stylo will no longer receive monthly security updates17
The company's security bulletins containing information about all the patches the company releases lists all the smartphones that should receive these updates. Here are all the devices that are NOT on the list any longer: LG G3, LG G4, LG G4 Stylus and LG Stylo.
LG will continue to provide security updates to some of the smartphones that are slightly newer than the ones listed above. Here they are as confirmed by the South Korean company: G series (G5, G6), V series (V10, V20, V30), Q Series (Q6, Q8), and X Series (X300, X400, X500, X cam).
If you own one of the smartphones eligible for security updates but haven't yet received the latest patch, LG says that depending on regions and carriers, these updates may be released monthly, quarterly or irregularly. So, there's that.