If you're trying to keep some of your communications secret, you probably delete your text messages so no one will find them. Oh, what a foolproof plan! Wait, that's not foolproof at all. For one, your texts are still saved on the phone of whoever sent/received them. Also, your texts are never really deleted.
That's because the SIM Card Spy can recover your deleted texts like they were never gone. A would-be spy can simply pop out your SIM card, stick it in this little device, plug it into your computer and get all the info off of it that's needed. It's a bit pricey at $150, but that won't stop everybody. Maybe it's best to just get you secret messages across via sign language, no?