1.防止别人盗用手机sim卡，如果启动了开机PIN码，那么每回开机后还要输入4位数PIN码。
2.在输入3次PIN码错误时，智能手机便会自动锁卡，并显示输入PUK码解锁，需要使用手机服务密码拨打营运商客服电话，客服会告知原始的PUK码，输入PUK码以后就会解锁PIN码。
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