Common problems with connecting to Wi-Fi networks include:
You can't get your iPhone to join a particular Wi-Fi network or (in the worst case) any Wi-Fi network.
You connect to a Wi-Fi network but have no Internet access.
You keep getting unwanted messages asking if you want to join a Wi-Fi network.
You automatically connect to a Wi-Fi network that you do not want to join.
You want to join a closed Wi-Fi network but don't know how.
Your Internet connection appears unusually slow.
If you have one of these problems, or a similar sounding problem, check out the suggestions in the pages that follow. Please note that some of the advice assumes that you've read the earlier portions of this section. Also, for more tips see http://support.apple.com/kb/TS1398 ...