You can go to
www.cellphonesforsoldiers.com I have an envelope that I received a while ago, but it doesn't state anything about being a tax write off, but there is a donation receipt that you can print out on their website. The profits help our troops call home. This organization was started by a brother and sister when they were very young, they are now teenagers. On the bag it does state to turn the power off. Keep the phone and battery attached if possible. If you have any questions or would like the bag, I can send you one. PM me.
Jenny