If for some reason your not receiving text messages on your lg g3 this can be extremely frustrating. The first thing you should try is deleting all of your current conversations. You might have too many messages in your inbox which wont let you receive any new messages. The next thing to try is restarting your lg g3. If neither of these work then you will have to perform a master reset. This is your last option and is the one no one wants to do just make sure to back up your data on your pc.