Did Software Update Cure iPhone’s 3G Sniffles?

After weeks of criticism lodged by a small but vocal group of users who claim the iPhone 3G drops calls and picks up weak signals when trying to connect to 3G networks, a software update recently issued by Apple may help nurse some devices back to health. The computer maker said its latest update improves the device’s 3G abilities. Not everyone, however, is convinced the fresh software has sufficiently done the trick. It’s also unclear what exactly is causing the supposed 3G problems in the first place.