Google has supposedly been looking into why many Nexus One users have been struggling with poor 3G coverage on the device, and has two answers for you. One of them is something you already knew: the device uses T-Mobile's network, which, while improving quickly, remains the smallest of the major wireless carriers. Posts to the Google suport forum indicate that the other major culprit is a software glitch. "Our engineers have uncovered specific cases for which a software fix should improve connectivity to 3G for some users," says a Google employee. "We are testing this fix now, initial results are positive, and if everything progresses as planned, we will provide an over-the-air software update to your phone in the next week or so."