Sim card readers for as little as $17.00 and other equipment.
For private investigators this website offers a few interesting gadgets.
This project details how to build a Smart/SIM card reader/writer for experimentation and investigation of SIM & Smart cards.Once the reader design is built, the open source software can be used to read and write from the card. Together they can be used to backup stored SIM card data, recover deleted SMS's and phone contacts, examine the last phone numbers dialed, etc.
Link: http://www.adafruit.com/index.php?main_page=index&cPath=27