SMS messages are all directed at QB. Why can't some be washed?

Click QQ. My wallet has a QBQ point in my QQ account. If you choose other ways to recharge, the webpage of account recharge will pop up. The penultimate item is to enter your mobile phone. Next, repeatedly enter the QQ number and recharge amount you want to reset. In the next 40 seconds, your mobile phone will receive a recharge message. You need to enter the corresponding number in the SMS to reply and recharge successfully. Note: Mobile phone balance. When it is less than 10, it seems that each recharge cannot exceed 2 yuan, and each recharge cannot exceed 50 yuan. The recharge amount cannot be traded for half an hour after 30 yuan.