Iphone won't connect with internet?

So on my iphone it says its connected to my home internet (wireless) but when i go on internet it says iphone is not connected to internet.
the IP address on my computer (where internet is working fine) and on iphone is different. I tried unplugging the rooter and plugging it back in but its still not working.
i think my brother put some kind of restriction on it so that it says its connected but won't let me use the internet.
anyone know how to sort this problem out? Really need help?
thank you

Added (1). The internet's working on everyone else's phones and laptops its just my iphone that won't work on. It stopped working on mine yesterday at about 9 pm ish.

Mines does that all the time and its really annoying but you just have to wait for about ten minutes then try to go on it later. Hopefully that'll work because its what I have to do with my iPhone

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