Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question. But I cannot answer it until I know whether your LG phone is an Android phone or not, what service provider (e.g. Verizon, Sprint, etc.) it is using, and if not an Android phone, what model it is, please.
Use the Reply To Expert function to let me know, please. And I will advise you as to how to go about the blocking of a number. Thanks.