Unicom's 3G prepaid phone bill balance is insufficient, and there is 6 yuan, but the text message says that it needs to be prepaid 194. Why?

If you are a mobile phone user of Shenzhen Unicom, Shenzhen Unicom has prepaid credit control money from 200 yuan, mainly to prevent the number from being used normally due to insufficient user balance. After the user pays the advance credit control fund of 200 yuan, the fund will be deposited into the user's account as an available advance deposit and displayed in the available line.

If the user pays off the arrears, or feels that the number balance is enough, there is no need to pay. If prepaid credit control service is not needed, users can call the local 100 10 manual customer service hotline to cancel prepaid credit control. After cancellation, the payment reminder received by this number will no longer include prepaid credit control funds.