Wifi connection problem with my iphone 4S

please help me with my iphone 4S wi fi connection problem:
before I can easily use the wifi conection with the available wifi networks but 2 days ago suddenly it doesnt connect to the previous wifi i am using, please help me what i will do.
thanks and best regards

For Others who may attempt to help here... See this Discussion.
https://discussions.apple.com/message/19252190#19252190

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