Well, I'm slightly surprised at that, but if anyone can do it, Qualcomm can. As for 3G bands, it is common enough to make a 3G system that supports 3 frequency

Well, I'm slightly surprised at that, but if anyone can do it, Qualcomm can. As for 3G bands, it is common enough to make a 3G system that supports 3 frequency bands. Supporting 4 is difficult, and 5 bands usually entails significant performance compromises. So since the carriers aren't all on the same bands, you usually have to pick and choose. The iPhone 4 previously had design issues with its antenna system anyway. They fixed it, or at least people don't complain about it anymore. But major fixes (like supporting an additional frequency band) might not be possible without significant re-design.