Wifes Iphone has lost connection to outr router and I'll be damned if I can figure it out. We have comcast/xfinity. At first we had the typical comcast address which is on the back of the router. Then FOR SOME REASON MY NOOK AND I believe my iphone started using xfinity wifi, open address, rather than the address that came with the router. My phone still works fine. Her iphone internet wont go through the router, but hits the tower down the street? Any ideas.

Unplug the router power cord, wait one minute, then unplug modem power cord, wait one minute, plug in modem power cord, wait one minute, plug in router, wait one minute then try to connect to the router with the iphone
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Obvious answer but after doing what redsix ticket suggested, if nothing happens, go into settings and make sure wifi is on, then scan the list of available connections and chose your router.
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I have unplugged/reset the router to no avail. Tried contacting comcast and the bitch hung up on me, because I was not coming in clearly enough. Now everytime I go on my iphone, FB, it is dumping me. This is getting on my nerves.
Posted from my iPhone/Mobile device