Why won't my iphone 4s connect to my home Wi-Fi?

A couple days ago my internet completely reset itself so we called optus and they said its because we have an old modem (theyll be sending a new one soon) but we got our internet working again, although its under another name, and a new password. Now i can't for the life of me connect my iphone4s to the Wi-Fi.i've tried going to setting>general>reset net work settings. That didn't work at all. Can someone please help me, its driving me crazy i've tried everything!

Read iphone manual - it is the easiest way.

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