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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 .
If the Nokia X6 16GB phone,displays invalid sim card message on the screen it is locked to some network.Please find out the network and country it is locked now.If it is locked to network,it will not accept other network sim card.But you saying it is accepting other networks sim card.How many network sim card have tried inserting in it?If you tried only one network sim card and it accepted that it is locked to that network.You can also try using some other network sim card.If it displays invalid sim message again.It is under network lock.To unlock it use unlock code.Visit the site Wickedunlock.com get code and unlock it easily.
Whether your Blackberry Bold 9780 not accepting other network sim
card?It is because of network lock.Without unlocking you cannot use
other network sim card in it.To unlock it you can use unlock code.Get
the unlock code from the site Unbblock.com and unlock it
from any GSM network sim card.You cannot use CDMA network sim card in
it.Check unlock code is available for your network and country,if it is
available get it and unlock it.Then use any GSM network sim card.It
won't display invalid sim or ask for an unlock code.Good Luck.