Not sure what mileage others have been getting but I've been watching things since the iPhone 5 and my data speed while on a call had gone done to under 1mb... Retested before and after the 5s launch and the speeds are back to "normal" 4S speeds of around 5mbs. Anybody else notice this? Only reason I noticed was that I use data while on phone calls all of the time and I noticed the drop in data speed. I am definitely happy, the returned speed is awesome!!