Why do you prompt "format error" when dealing with the communication between two cities?

Maybe when selecting a specific virtual number, if the received short message prompts "format error" or "short message format does not conform to the specification", you can select the number and reply the serial number of virtual number Y instead of the virtual number after receiving a short message with five numbers, so that the customer can try again. For example, if you look at the virtual number 2 in the number selection process, the customer needs to reply to the short message "Y#". Customer service 39 answers for you. The traffic supermarket has a complete range of goods, and you can freely choose traffic packages, packages, voice packages and holiday traffic packages according to your needs; The official account of China Telecom's customer service WeChat in Guizhou replied that the keyword "flow supermarket" can be handled directly, which is convenient and fast.