Why do I get a message with 86 in front but no+? The reply is always unsuccessful. What happened?

Some places in the SIM card business hall are called "SMS business hall". The reasons for not receiving the reply may be that the local mobile has not set the corresponding business code, the code in the sent message is unrecognizable, and the mobile lacks the return error prompt and cannot receive the reply. It is also possible that your traffic package is not a standard package of how many yuan and how many meters. In some cases, you can't use the SIM card business hall to inquire. It is recommended to use manual customer service inquiry, because if it is a non-standard package, it may not be found in the online business hall.