Dobro došli na t99.pl!
I am sorry, but Croatian version of this site is not yet available. I think, that T99 will be usefull for you (to remove diacritical marks from letters Ć Č Đ Š Ž from Croatian alphabet that cause decrease maximal length of sms from 160 to 70), so please read about T99 in one of the following languages:
If you can speak Croatian, please help translate the site to this language - send me an email, I will write you all details in an answer. Thank you.