for some reason my phone somehow switched itself off on saturday. and it now will not switch back on. when i attempt to switch it on, i get as far as typing in the 4 digit pin number, at which point it automatically turns itself back off. once the screen goes blank, the words 'contact service' appear in black letters. this has never happened before and i'm not sure why its happened. the battery is fully charged so cannot be that at fault, please help?
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