If there's one thing the iPhone 4S seems to be screwing up after its very successful debut, it would seem to be Sprint's 3G. Since the launch of Apple's newest iThing, Sprint 3G speeds have absolutely tanked for users in many areas. How widespread is the problem? Well, this 45-page (and growing) thread with nearly 700 replies over on the Sprint Community forums would seem to indicate the answer is "very."
The problem has affected everyone - as shown by lackluster results from some of our own Sprint devices of late while on 3G.
Samsung Epic 4G:
Motorola Photon 4G:
iPhone 4S users are reporting speeds even lower than these, sometimes much lower (like 50kbps).