MiFi uses a 3G signal to create Wi-Fi signal for up to five devices. Charlie Sorrel of Wired called it “a bubble of Wi-Fi that surrounds you wherever you go.” Sorrel spent two weeks using it and wrote a review on Wired. It acts just like a normal wireless router, complete with port forwarding and key-protected access. The battery is claimed to last four hours. Sorrel said he never drained it, but it seems that he wasn’t attempting to use it for long periods of time. It takes about 30 seconds to start and turns off after five minutes of inactivity. In addition, it can be connected via USB without the thread of a dead battery.

 
This sounds like an amazingly cool gadget, but I’m not ready to start saving for one just yet. If I was still in high school, this would be amazing! I used to carry my laptop with me, and I spent most of my time out of the house, so I’m sure this would have been incredibily useful. At this point in my life, when I’m out of the house, I’m doing something. If I need to look something up, shoot off an email, update a social network, or just check a social network, my iPhone works just fine. Still, a personal bubble of Wi-Fi? Yeah, I want that.
Source: Wired