My iphone4 cannot detect any wifi networks.. Please help me.... :(, My iphone4 cannot detect any wifi networks.. Please help me.... :(

I live in Greece and a few days ago I received the iphone 4 from a friend in the UK. Great B'day present don't you think? Though it accepts my Greek sim card and 3G seems to work fine, it does not detect any wi-fi networks including my home one. Please help me, what do I do with such a beautiful phone if I am not connected to the internet? 3G is expensive here and I need to start using this beauty ASAP!! Thank you in advance.
Kat

Turn off the phone and put it in freezer for 10 mins.
i have encountered the same problem and fixed .

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