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How can I make Google Voice attach a signature to all my outgoing SMS messages?
Not possible yet.
What you want can be achieved using a Greasemonkey script. You can take an existing one from userscripts.org - start with one that works on Google Voice (like this one) and add your signature.
You can do it using the Mo+ app.
Go to your Mo+ setting, click Google Voice, click signature and change it the way you want.
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