If your Nokia 6300 says sim card registration failed, when you have inserted a sim card, i suggest you clean the sim card contacts. If that doesn't solve it, then update your Nokia 6300 to the latest firmware. If you updated the firmware and there is still no success in solving this issue, it clearly shows your phone is blocked. When a handset is blocked, you can't make calls and texts. The reason why it is blocked because the imei number was probably reported lost or stolen to the network provider.
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