After the phone bill is charged to 40, send a text message saying that the available balance is less than 20, and the traffic cannot be used.

1. According to the information provided by you, if the balance is insufficient after payment, it is not excluded that the deduction fails because the payment has not arrived or the payment amount is insufficient to offset the arrears.

2. You can use the traffic when the mobile phone number is normal. If it cannot be used, it is not excluded that the traffic belongs to directional traffic, idle traffic and other traffic that can only be used under certain conditions. For details, please contact Unicom's manual customer service for consultation. The actual situation is subject to local policies.

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