Using some unicode symbols result in error message when saving articles...?

[@rjen]

Back to the original topic - could the mb_substr be the cause of saving Articles with unicode symbols as well?
I tried saving an article with an 📧  (email) 📱   (phone) symbols, and got the same error:
Database Error
Incorrect string value: '\xF0\x9F\x94\x90&n...' for column `c5jnzrz36_db538176`.`smf_tp_articles`.`body` at row 1
File: /customers/c/c/a/c5jnzrz36/webroots/r538174/medlemmer/forum/TinyPortal/Base.php
Line: 285

(and to reply to my own question; no those seem unrelated)

Yep complete different topic. It seems that it should work if your database collation is utf8mb4_general_ci, which it is probably not.
I read somewhere that SMF has some sort of trick to deal with it, which explains why it is not a problem in posts.

I have no clue what that trick is, so I cannot help with that...