Same here... happend last week. My phone was in my front pocket and I went to use it and noticed it wouldn't respond. On closer inspection I could just make out a single hairline crack with not a mark on the protective film. Went to Vodafone and all they did was check to see if my phone was insured, no mention that the screen cracking of its own accord is a very common problem. Have contacted the support team and will await a response!
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