Hi if your sony ericsson k800i mobile is rejecting your sim card whether it is diaplying messages like sim invalid ,sim lock and so on then it mean your phone is locked to some other network provider due to this you can't use other network sim in it until you unlock it .You can easily unlock your phone using sites like Unlocking4U.com they are rendering unlock code for all mobile models at reliable cost .You first check that whether the code is available for your country and network provider .If yes then pay for it and unlock your phone then freely use any GSM sim in it .
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