Using Teleflip (a free service with sign-up; Wikipedia entry), you can send SMS and MMS messages via any email client. This blog post contains AppleScript code that will parse mobile numbers in your Address Book, and add them as email addresses in a 1234567890@teleflip.com format. Here's the source (robg: with permission of the author) in case the blog post ever vanishes:tell application "Address Book" repeat with this_person in every person set the_number to "" repeat with i from 1 to the count of phone in this_person if label of pho...

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