Excuse me, how to send "hands-free SMS" on my mobile phone?

Control characters are added to the format information of the short message, which will be displayed in hands-free form as long as it supports mobile phone recognition.

You don't have to send it by SP, as long as the mobile phone supports this function. Some STK card menus also have this function, and some PC software can also be connected to mobile phones to send. In short, as long as you add control characters, it is hands-free SMS.