suraj.sun writes: PCWorld tested 3G and 4G wireless data transfer speeds--indoors and out--for AT&T, Sprint, T-Mobile, and Verizon, at multiple locations in 13 major cities. Here's what they found. AT&T's new LTE network turned in the fastest download speeds of any 4G service. Its 3G service was very competitive, too--and those two results help make a strong case for AT&T dual-mode 3G/4G phones. T-Mobile's HSPA+ 21 service won in the 3G bracket of our study, and the company's high-end HSPA+ 42 service competed reasonably well with other providers' 4G service. Verizon's 4G upload speeds are top-of-the-line, but its 4G download speeds don't match AT&T's. Sprint was consistently a laggard in our wireless speed derby. The company seems to have virtually stopped developing its existing 3G and 4G networks while looking for a way to make the transition from its outdated WiMax 4G technology to LTE. In the 11 cities in our test group where the AT&T's new LTE service is available, the network delivered an average download speed of 9.12 mbps. That's about 25 percent faster, on average, than Verizon LTE's download average of 7.09 mbps in those same ten cities.