According to MacRumors, a thread on Apple’s Support Communities page makes contains numerous references to Wi-Fi router security settings.
User Byran85 wrote:
“I just got done setting up my iPhone 5 (as new, not restore). I was trying to download my music from iTunes when it seemed to be taking forever. I cancelled the downloads and then kept testing the WiFi in various other ways. Just loading the app store, my iPhone 4 will load anything faster than my iPhone 5 right now. I’ve rebooted the router and tried multiple devices and have narrowed the problem down to the WiFi in the iPhone 5. I’ve also tried using different bands, 2.4 and 5 both produce the same outcome. I launched speedtest.net app about 2 minutes ago and hit begin test. Its still “finding the closest server”. I have also tried the reset network settings. Still the same issue.”
Other users complain about the same problem of slow to no connectivity, while others report slower-than-normal connectivity.
An image posted by @I_Am_Lucas shows ~2.5Mbps (~300K/s) on his Wi-Fi network, with some users getting speeds of down to 0.5Mbps (~62K/s).
AppleCare confirmed to an Apple forum poster that Apple is aware of the issue, but they have yet to find a solution to the problem.
“Just spoke with iPhone AppleCare and they are definitely aware of the problem and Apple engineers are working on it. I asked if it was hardware or software related and she said the WPA2 issue seems to be software based and the non-connecting issue may be hardware based, but that they are still trying to identify the cause.”
Complaints about new iPhone units coming with scuffs and scratches out of the box have also been reported.