Iphone and droid phone won't read wi-fi?

We have 4 iPhone 4s, two droid phones, an ipad, and 2 laptops connected to wi-fi. Now for some reason one iphone and the two droid phones show full bars to the wi-fi, but won't connect to the internet.

Make sure you reboot the two droid phones as well as letting your modem rest (turned off) for 10 minutes.

See why the device is connected, but there's no internet here, http://www.mywifirouter.me/blog/why-theres-wifi-hotspot-but-no-wireless-internet-connection/

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