I have AT&T and would like to upgrade to a nexus 4 from the iphone 4. I know I'm being a bit of an idiot because I'm giving up LTE, but honestly I'd be happy if my network speeds were only moderately faster than with the iphone 4. So, does the iphone 4 take advantage of the hspa+ network to its fullest? Would download speeds be any faster with the nexus 4? In my home city I get download speeds of 1.51 Mbps with the iphone 4.