If your Sony Ericsson K800i displays invalid sim card message on screen,it is locked to network.You need to unlock it.So that you can use other network sim card in it.Without unlocking you cannot use other network sim card in it.Visit the site Theunlockspot.com get unlock code for Sony Ericsson K800I phone and unlock it easily.Then use any GSM network sim card in it.
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08-28-2013, 01:43 PM #2Unregistered
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