New iphone 4 and can't get a signal?

Hi, I got a iphone 4 on contract yesterday and the signal is horrible. It constantly cutting out keeps saying searching for networks, same with the Wi-Fi, I hook it up to my connection at home and that is also really crap cutting out and unable to find a connection.
I have never had an iphone before so not sure if there's some settings I need to set up or somet, but any help will be greatly apperchated.

Try restarting your phone by holding the home and stand by button (on top of your phone) at the same time, for a few seconds and try again

Something is weird… Try reseting your network settings (General - Reset - bottom)

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