You know how the Apple iPad 3G doesnâ€™t make use of a regular SIM card for its cellular identification? You know how it uses a micro SIM card instead? What if you wanted to use a micro SIM in a place that normally takes a regular SIM? Many enthusiasts out there have already taken their scissors to regular-sized SIM cards, trimming them down to micro SIM proportions for use with the iPad. The question is, how do you add that material back? As it turns out, a company saw the business opportunity and capitalized on it with the microSIM card adapter. It does exactly what you think it does. <imgsrc='http://www.chinamobilephonereview.com/RIG/image.php?image_id=1' height='100'> Plunk in your newly sized micro SIM card into this adapter and, voila, it looks like a regular SIM card again. This way, you can effectively use the same SIM card for your iPad and for your iPhoneâ€¦ just not at the same time. It does mean that you can save by only having one wireless data plan though. Useful or not?