I use 139 email to send free messages. What do you mean you can't send it without a correct mobile phone account?

Maybe I want you to register email, because you often send emails, so you may be prompted whether to bind 139 email.

So you can bind your email 139, which is very easy to use and won't suffer, and you can also send 20 (as if) messages to users of China Mobile for free every month.

hope this helps

Or you can go to the help center 139 to have a detailed look.