You can say all you want about those Chinese knockoff phones, but they all have one very useful feature the iPhone doesn't: they work with dual SIM cards. A new accessory, unimaginatively named Dual SIM Card for iPhone 4G with Back Cover, now lets you do the same thing with your genuine Apple-branded handset.
Available at USB Fever, the accessory uses a special adapter that goes right into your SIM tray. This is connected to a two-SIM dock that's designed to sit flat on the back of your phone. You'll need to use the included transparent back cover or a different case to hold the dual SIM assembly in place.
The contraption requires no jailbreaking, but is only guaranteed to work for iPhone 4 handsets with firmware versions 4.0.0, 4.0.1 or 4.0.2. No extra software is needed, with both SIMs easily accessible from the SIM Applications menu. You can also have it switch automatically between SIMs whenever the active one suddenly gets a very low signal.
It is, by no means, a sophisticated solution. For one, it doesn't support dual-standby, so you can only have one SIM active at a time. Plus, according to the sales page, it will take between one to two minutes to switch from one number to another. For iPhone 4 owners traveling in other countries, though, this makes picking up and using a local prepaid SIM a considerably easier process.
USB Fever has the Dual SIM Card for iPhone 4G with Back Cover for $28.99 each, plus $2.99 shipping. If you're a frequent traveler, it might be worth trying.
[USB Fever via Gear Diary ]
