Iphone 4s connects to wifi but internet doesn't work. Driving me mental, help!!

Been having issues with phone for the last few months, it cuts out the internet 2/3 times a night and I have to reboot the wifi. I originally thought it was the wifi (which it possibly still is) and got a new router, but now the phone connects to wifi but the internet won't work at all. I've looked on a few other posts about changing the DNS but it hasn't helped. We have a few other devices in the house which connect to the internet perfectly, so I really don't know what the issue is. Someone please help!!
Thanks in advance.
Sarah

Hi, KK93. 
Sometimes a simple power cycle of the router and Mac can resolve the issue.  However, try the steps in the article below to troubleshoot the Wi-Fi issue with your MacBook.
Troubleshooting Wi-Fi issues in OS X
http://support.apple.com/kb/HT4628
Also, see the article below to make sure the router setting have been optimized for performance.
iOS and OS X: Recommended settings for Wi-Fi routers and access points
http://support.apple.com/kb/HT4199
Cheers,
Jason

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