The Tata DoCoMo Photon Max Wi-Fi Duo has a name that’s almost too long to keep track of, but it’s also the most useful personal Wi-Fi hotspot we’ve used. The Duo has a built-in battery so you can charge it up at home and then use it to connect your devices to the Internet on the move. The cool part is that it also has a standard USB port, and this can be used to recharge your phone....