Can not connect iphone 3g to home wifi

My iphone won't connect to home wifi. Does not even show it as finding it. However, my other iphones connect just fine.

Does the iPhone connect to other wifi networks?
If yes, then I would suggest that you turn off your wireless router for 10+ seconds. Power it back on and see if the iPhone 3G works to connect to the network
If no, then you could have some faulty hardware in the iPhone. Try to turn the iPhone off, and then on again as well as the wifi setting on the iPhone. If it still doesn't work then try to reset first, followed by a restore from a backup, and then restore the iPhone as set up as a new iPhone. If after all that it still doesn't work then it probably is a hardware issue

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