Wifi disconnected

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this new iphone 5 showed problem because de-linked of wifi (of my home router and other routers)
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Hello Kasee,
Thank you for the details of the issue you are experiencing with Wi-Fi on your iMac after upgrading to OS X Mavericks.  I would be concerned about this too. 
I recommed following the steps in the section labeled, "Symptom: The network connection drops unexpectedly" in the following article to resolve an issue like the one you described:
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Thank you for posting in the Apple Support Community.
Best,
Sheila M.