My iPhone won't download anything?

Usually whenever I purchase something from the AppStore and iTunes, my iPhone asks me to type in a Password and then whatever I have purchased downloads straight away afterwards.

However now, for some reason when I tried to purchase some songs and download a free game. Nothing happens and my phone doesn't ask me to type in the password.

I've not tried it on my computer yet though.

Just hold down the home and sleep button until it goes balck and let go if that doesn't work then just back it up and restore it in itunes

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