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I accidently pressed something on the settings screen and now when I turn my phone on it asks for a PUK code which I don't know. How can I get into my phone as it won't let me?
You will need to speak directly with your network provider as your PUK code is specific to your SIM.
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Call to you NW provider in this case he will make it easy for you.
Do not enter wrong PUK many times otherwise your SIM well be blocked
what is a netwerkprovider?