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If your Nokia 6300 phone displays an error message saying "Invalid Sim (or) Sim Registration failed" then your phone is probably network locked.
You can unlock it easily by using an unlock code.You can get this code at reasonable cost from TheUnlockArena.com with easy step by step unlocking instructions and unlock it.Then you can use freely any GSM network Sim card.
before registering my cell phone i used to use 2 sim cards. After registration it allows only my first registered sim card, not any other, even if it is from the same company. If i put another simcard even if it is from the same compan, it gives the messege ``Illegal use. power off`. It is very hard i can't put 2 sim cards and when i travel to another country i have to use another phone.
take out battery and sim clean the little slot were the sim goes and the shiny golden parts on the sim with a cotton swab wait 30 seconds then put it back together hope this helps(please rate and vote)
try to insert your sim to other mobile then try balance inquiry after you have recieved the message turn off your mobile, remove the sim card and insert it again to your nokia 5800.
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