You might recall that earlier this year, there was a rumor going around that the next iPhone would feature dual SIM card slots. This would allow users to connect multiple phone lines to the device, eliminating the need to carry multiple phones.
While we haven't heard any follow-up information suggesting Apple's next smartphone will sport the dual SIM option, we have seen several accessory makers offer the feature for the current line of iPhones. The latest product we've seen surface, just like the Rebel 2Phone, adds a second SIM tray to your iPhone 4 via a removable case...