1、确认是否有网络,建议您可在信号强的地方使用;2、检查帐户是否还有话费,如果余额不足则需充值后才能使用;3、确认是否已设置好手机参数;4、检查USIM卡是否有插好,如果已插好但还是无法使用,则建议您[详细]
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