I need to create 3 groups based on specific area codes in California. For example, Group 1, will be called Northern California and will contain data based on area codes 707, 530, 916, 209. Group 2 will be called Los Angeles area and contain data based on area codes 805, 213, 323, 818, 562, 714 and Group 3 will be called Southern California and contain data based on area codes 858, 691, 760. Since the area code is not separate and is part of the entire phone #, how would I write this formula?