iphone 5s connects to wifi but says no service

I just received an iphone 5s today in the mail. Everything seems to work fine, except for the wifi. It allows me to turn wifi on, and connect to my wifi (There is a check next to the wifi network letting me know it has connected) but it says "no service" right next to wifi signal in the top right corner of my iphone. I have tried resetting the network settings, and turning the internet box off and back on, and neither has worked. I have 2 computers that are connected to the wifi, so it does not seem to be an issue with the actual wifi/internet.
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