Why won't my Iphone connect to my Wi-Fi? - 1

For some reason although on my Wi-Fi settings it is saying my phone is connected, it is not allowing me to use any of my apps that acquire the internet and saying that there's no connection. My macbook is also now having problems connecting to the internet but my spare laptop is having no problems what so ever with connection. I normally have no problems with the Wi-Fi in my house why is it suddenly doing this?

Probably an IP address conflict or a failure to allocate an IP address. Turn the router off and on again to force a fresh connection.

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