Why won't my iphone 4 connect to a certain Wi-Fi network?

I have tried countless numbers of times to connect to a certain Wi-Fi network but continue to receive the same message, "Unable to join… ". I have reset the network settings in my phone but it still doesn't work. Any suggestions?

Perhaps the Wi-Fi network you are attempting to join has blocked you?

What certain Wi-Fi Network? Are you talking about a Starbucks public or your house Wi-Fi or neighbors? Please elaborate the situation.

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