+ 8731: 15.000 vnđ/sms
+ 8631: 10.000 vnđ/sms
+ 8531: 5.000 vnđ/sms
+ 8331: 3.000 vnđ/sms
+ 8231: 2.000 vnđ/sms
+ 8131: 1.000 vnđ/sms
+ 8031: 500 vnđ/sms

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