Help long sms is converted automatically mms??

[mrex]

am i some kind of blind or what... but i cannot find a setting to end converting long sms messages to mms messages!? everytime i write long sms message they are on some point automatically converted to mms. a device doesn't ask me would i like to do that or not, it just does it... how to turn it off?

edit. nevermind, just found it, lol... it's called creation mode or something like that in english...