Not all wireless carriers are created equal, nor for that matter is all 4G -- anyone who's ever swapped networks or done any sort of traveling across the country can tell you that. And while it seems like we have fewer and fewer choices as the days go by, our increasing reliance on mobile devices makes the efficiency of our data delivery all the more important. PCMag invested some serious man / woman-hours for its annual "Fastest Mobile Networks" story, gathering mobile data in 21 cities -- running more than 140,000 tests in all. According to the results, Verizon's L
