https://fixyourandroid.com/fix/network-locked-sim-card-inserted/
“Network locked SIM card inserted” or “Invalid SIM Card” is the error android users have reported while trying to activate a new SIM card on their phone. This can be caused by a series of problems. But, how to fix the error and get your SIM card to work on the device? What causes your android to show “Network locked SIM card inserted” messages? Let’s find the answers.
 

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