This is a very interesting post on Cellphone spam. It was easy to set up the blocking and allow certain email addresses to send to your phone. I don’t know if I will ever use this feature, but it is better to be prepared against cell phone spam.
clipped from

How to Block Cellphone Spam

The beauty of this feature, of course, is that it blocks ONLY text messages from the Internet. Your friends, using cellphones, can still text you.

* AT&T: Log in at Under Preferences, you’ll see the text-blocking and alias options. Here’s also where you can block messages from specific e-mail addresses or Web sites.

* T-Mobile: T-Mobile doesn’t yet offer a “block text messages from the Internet” option. You can block all messages sent by e-mail, though, or permit only messages sent to your phone’s e-mail address or alias, or create filters that block text messages containing certain phrases. It’s all waiting when you log into and click Communication Tools.

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