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I probably knew about Internet ((Email, basically.))-to-cell-phone spam before this article from David Pogue - or maybe I read it in 2008 - but after getting my second text message spam in about seven weeks ((No, they're not really flooding in, but this is how much it annoys me.)), I did some research.

On AT&T, http://mymessages.wireless.att.com/ will do it for you. One note though - your regular AT&T Wireless login information won't work here. Create a new account (I set mine to the same password).

Then change this setting:

You can also set up your alias, which I've done should I ever need to subscribe to text messages for flights or something.