What should I do about my mobile phone screen?

Recently the phone screen on my Samsung X820 started displaying incorrectly, then the phone would turn itself off. Now the screen is completely unviewable (there are horizontal white lines across it). I didn't take out insurance on the phone. Is this something that the manufacturer or network can rectify... show more Recently the phone screen on my Samsung X820 started displaying incorrectly, then the phone would turn itself off. Now the screen is completely unviewable (there are horizontal white lines across it).

I didn't take out insurance on the phone. Is this something that the manufacturer or network can rectify for me?

Is it poissible to buy replacement screens? The phone is only about 6 months old, should it still be covered by some kind or warranty?
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