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Your Sony Ericsson K800i has been locked to some specific network. That is why it displays such message. You can unlock your Sony Ericsson k800i safer and easier using unlock code. You can get the unlock code for a Sony Ericsson K800i from www.theunlockspot.com at affordable cost with easy unlocking guide. Good luck mate.
The PUK code is availlable from your network service provider. This number was on the plastic card that your SIM card was attached to. If you don't have it, only your Network Service Provider can supply it to you.