Vouchers are not applicable to SMS products.
SMS service is billed on a prepaid basis, which cannot be used until an SMS package is purchased. Although your Tencent Cloud account balance is sufficient, an error is returned if you do not purchase an SMS package. The service is resumed when the SMS package you purchased takes effect.
This is probably caused by a late payment for a postpaid Tencent Cloud service, resulting in the suspension of your SMS service. Check your Tencent Cloud account balance. If your account balance becomes negative, the service is suspended due to arrears. When you pay off the arrears and your balance is greater than 0, the service is automatically resumed, which may take several minutes.
The package purchased takes effect within 5 minutes and becomes invalid upon expiration. When purchasing an SMS package, you will be notified of the type of SMS messages that can be sent and the rules of sending SMS messages. If SMS messages cannot be sent due to inconformity with rules, or if individual users have no permission to send marketing SMS messages, the purchased package cannot be unsubscribed/refunded regardless of whether the package is used or not. For more information on how to use SMS package, please see relevant document.
Tencent Cloud provides the SMS bill of the previous month before the 3rd day of each month. You need to pay the bill not later than the 8th day of the current month. Otherwise, Tencent Cloud will suspend your service till you pay off the arrears, and you are held liable for any consequences arising from such suspension.
The operator will only charge the sender a fee for user's reply.