Now, you can’t have both SIMs active at the same time – that’s a limitation of the iPhone 4, sadly – but you can apparently switch between them without having to reboot the Apple smartphone. According to USBfever, you can simply pick the correct card from the SIM Applications menu in the iPhone 4?s settings, and after a minute or two it flicks over. You’ll need to be running iOS 4.0.0/4.0.1/4.0.2 for that to work, though. The adapter case is on sale now, priced at $28.99.

via Gear Diary