Iphone 4s help

two weeks ago apple had to replace  my phone... was working fine for the first week then my wifi started acting up i taught it was my modem but it isnt my laptop connects to my wifi perfectly fine.. my old phone use to connect to wifi automatically and the new phone i have recieved it sometimes connect or does not connect at all and right now its turn off and wont let me turn on what is the promblem software promblem please help.

Here are a couple of steps to take, hope this helps.
http://support.apple.com/kb/TS1398

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