We have 4 lines in our family plan. All 4 lines get spam texts. I line was billed $9.99 a month for 5 months from a 3rd party unauthorized company. I just disputed this with at&t. Currently we have unlimited texting and we want to take it off since we all have ios5 and can text for free. How do I block all texts from coming in? If I do that can I see texts from people like family, friends, etc....?