Cell phone sim cards are just starting to catch on in the US, but most non-US travelers keep a stash of sim cards to avoid costly roaming charges. (Let’s just say I almost fainted when I got my phone bill after a conference call from London.) Another great use of the sim card is being able to switch to a new phone with ease - I gave my unused Motorola phone to an employee who lost his (I have switched to the Samsung P777 - more on that later) and he just popped in his sim and was up and running - phone book, pics and all. But today there is even better news.

A Chinese company has figured out a way for cell phone users to swap between two sim cards without physically removing them - the TwinSim is perfect for travel between two countries you do business in the most, or even for phones you share with your employer. Card A gets billed to the company, card B calls you pay for, and best of all, you don’t have to turn off the phone to switch cards.

[Continue reading Manage Two Sim Cards in One Mobile Phone With TwinSim]