Taobao's 40 recharge for 100 phone bills promotion is not necessarily reliable. There are certain risks in purchasing phone bill recharge activities on Taobao. Although some merchants may offer real promotions, there are also some bad merchants. They may resort to fraudulent means, such as providing false recharge cards or unauthorized recharge methods, which will cause users to be unable to recharge normally or suffer financial losses. In order to avoid losses, it is recommended to choose merchants with high credibility when purchasing phone bill recharge on Taobao. You can judge its reliability by checking the merchant's evaluation and credit rating. In addition, you can also choose to use official channels for phone bill recharge to ensure safety and reliability. If you encounter any problems, you should contact Taobao customer service or operator customer service in time for help and solutions.