My SMS become MMS after I put in very few letters?

[AC Question]

My SMS become MMS after whereas I put very few letters

I have a Samsung Galaxy S5 mini, and my SMS become MMS after very few letters.
I already tried everything I saw on the internet to fix this problem, but nothing works : I changed the input mode in my SMS settings, I changed the MMS setting into "limited", but nothing changed.

Does anyone have another solution? I don't want to download an application.

Thank you in advance

 

[B. Diddy]

Welcome to Android Central! Are you sending messages in English or another language? Certain other languages might be converted to MMS because of special characters.