Can't connect to wifi

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http://forums.androidcentral.com – Last night I lost the wifi on my phone, while sitting about 5 feet away from the router. It tries to connect... Says "connecting" then "obtaining IP address" then "safe, secure", back to "obtaining..." round & round. I'd spoke with a guy at Sprint earlier to figure out why I can't send pics thru Handcent (bc the 4.1.2 update messed it up apparently), and he did something where I dialed a code & my phone reset. Could that be my problem? I'd rather get help here than call Sprint again, as I'd have to use this phone to call & I'm pretty sure (HowTos)