One of our readers just sent me a message saying he picked up a Sprint 4G signal in San Jose, California. This is odd because the only 4 cities in California that officially have Sprint’s 4G network are Merced, Visalia, Modesto, and Stockton (see here). And of course, the Sprint 4G coverage in San Francisco that has been coming online over the past month or so. But 4G in San Jose? That’s quite a long ways from San Francisco for 4G coverage to be picked up. What do you think, is Sprint expanding into San Jose covertly?