Iphone 4 won't connect to broadband?

Help! My broadband won't connect to my iphone 4 but i have no problems connecting to my laptop.nothing at all happens when i try to join the network from my phone. It was connected before but has suddenly become problematic. If you can help, please explain in non-geek as i'm not very savy with computer talk! All the same all advice would be muchly appreciated!

Re-check that all the login credentials are correct. I would re-type the password in again to make sure you have it correct. Check that Airplane Mode is OFF, this stops Wi-Fi signal. If problems are persisting then I would contact Apple for support via their website.

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