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Is your phone locked with any particular network?I suggest you can approach Mobileunlocksolutions.com and specify the country,locked network of Sony Ericsson Cyber shot K800i.Based on the availability you can get the unlock code along with free instructions.
switch off ur phone , remove ur memory card , wipe the golden coloured connecters with a damp cloth , insert it and remove it 2-3 times in quick succession , insert it start your phone and it should work fine , just try this it really works.
Someone told you the motherboard is out of service? Does this mean it is broken? did the provider put a lock in it from non payment? If they did you may be able to reflash that software and clear the lock. or get an unlock code to clear the provider locks. If the mother board is just damaged, then replace it, but if its not damaged the phone can be unlocked from your provider