Blocking IPhone SMS Messages

I have an iPhone 3GS. I haven't paid for a texting plan.The problem is that advertisers have found my phone number and text me. I receive from five to ten unsolicited texts each month. Is it true that AT&T charges 20� for incoming text messages when you don't have a text plan? And how can one block receiving all text and messaging to the iPhone?

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Source: http://www.notepage.net/blog.htm#1102

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