Is it true that AT&T iPhone 4S data speeds have been upgraded to HSPA+? What about Verizon? I'm currently on AT&T and my iPhone 4 constantly drops calls. Plus I get almost no reception inside most buildings. Verizon customers don't experience any of that. At the same time, I don't make too many calls to want to sacrifice speed. How much difference in data speeds will there be between AT&T and Verizon iPhone 4S? Is it significant? Is Verizon's 3G similar to dialup? Thanks in advance for your input. P.S. I'm in NYC.