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Check out an App called "SMS Export 2X" here: http://goo.gl/TS2Ct
According to the developer you can Even email the texts to yourself, and print them off. Here is the description. But I am sure this is exactly what you are looking for
SMS backup app,
SMS Export - 2X let you achieve , search and backup your (SMS) messages ,allowing you to delete those old text message from your inbox. You can export them to your SD card , print them off or send them to you email address,
SMS Export is a true archiving system. Allowing you to also find text message from people or a particular text message that you received from someone that your trying to find
Backup your SMS Text Messages to you gmail. With your Google phone you can Backup and save your text message , you can search for text message by text or name. You can set a time and date to backup your text message so you dont forget.
Export Text Message , SMS Export
Save text messages
Email Text messages
Backup Text Message
Schedule and Backup Text
Search Text Messages
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