Check whether the mobile phone is stopped due to overpayment, and suggest payment and recharge;
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two
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Check whether the phone is set to call transfer, enable flight mode, call restriction, etc. It is recommended to cancel and try again;
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three
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Check whether the function or signal of the mobile phone is normal, it is recommended to replace the mobile phone or location and try again;
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four
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Try to restart or replace the phone to see if it can make calls;