You have to upload the picture from your phone to an online photo service, like flickr or photo bucket or something, and then edit your signature and change the URL (http://www.whatever.com/somedirectory/yourpicture.jpg) to the new picture. Look for this in your signature:
I usually email it to myself and put it in the DIS photo gallery or upload it on Facebook. Once I have it there I can get the url properties to post the pic here on the DIS.
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