Thanks to a small plastic adapter, iPhone owners can take their micro-SIM card and use it with another cell phone.
Kent GermanFormer senior managing editor / features
Kent was a senior managing editor at CNET News. A veteran of CNET since 2003, he reviewed the first iPhone and worked in both the London and San Francisco offices. When not working, he's planning his next vacation, walking his dog or watching planes land at the airport (yes, really).
Apple started a new trend when it introduced the micro-SIM card found in the Apple iPhone 4 and the iPad 3G. Like a regular SIM, the micro-SIM holds the necessary subscriber information while losing some of the plastic border. Apple says that the smaller cards make more room for a larger battery, but they also come with a couple of trade-offs. For example, the smaller size means that the micro-SIM won't fit into a standard card slot an vice versa.
Leave it to the marketplace, however, to come up with solutions. We've already told you about a tool that will shave a regular SIM down to size, but you also can buy an adapter that will give a micro-SIM the extra girth it needs to fit into another phone. We ordered one from BuyMicroSIMadapter.com and tested it with an iPhone 4 micro-SIM.
The process is about as easy as you'd expect. Just snap the micro-SIM into the tiny plastic tray and and insert the whole thing into your alternate handset. We used it with a Samsung SGH-A177 and didn't encounter any problems with registering the micro-SIMm and making calls. We'd recommend an adapter for any iPhone owners who may want to use other handsets occasionally while retaining their phone number.