Are the text messages sent to the 139 mailbox free? Why is it said that 50 messages are given for free but there is still a charge?

Free text messages to 139 mailbox can only be sent to mobile numbers, China Unicom or China Telecom numbers are not included. The 50 free text messages means that you can use the 50 free text messages sent to mobile phone numbers. After the 50 free text messages are exceeded, or sent to external network numbers, you will be charged according to the normal text message rates of China Mobile. If you still have problems using the 139 mailbox, you can call 10086 for consultation, or you can report your situation to service@139.com. This is the customer service email of 139 mailbox. I believe they will get back to you soon. Reply!