From 3jam: 3jam adds reply-all to text messaging and makes it easy to text with several friends or co-workers at once! Use the 3jam application to compose your message, select your recipients and hit send. The recipients only need to reply to your text message to participate - they do not need the 3jam application. 3jam does not charge for the service and you simply pay your regular text messaging fees to your wireless provider - one text message per reply. Version 1.0 may include unspecified updates, enhancements, and bug fixes.
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