<!-- from fixya rte -->How to solve nokia 5230 sim not valid - Nokia 5230 Cell Phone

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HI is your Nokia 5230 mobile is displaying sim not valid message once you insert your sim in it then it mean your phone is locked to some other network provider due to this it wont accept any other GSM sim until you unlock it ..You can easily unlock your phone through sites like Unlocking4U.com here they are rendering network 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 it with any GSM sim ...