How to write the format of mobile phone short message?

SMS has no format, because SMS is not as formal as traditional letters.

The format of writing traditional letters:

Example: ("_" indicates a space)

Dear XX (or dear, etc. ):

_ _ Hello!

_ _ (Text)

———————————————————————

-Hereby.

Salute!

———————————— (School)

——————————— (class)

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ (name)

_ _ _ _ _ _ _ _ _ _ _ _ _ _ (date)