A standard SMS can only contain characters from GSM alphabet (including line break and space):

ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz 0123456789 @£¥èéùìòÇØøÅåΔΦΓΛΩΠΨΣΘΞÄÖÑܧäöñüà _^|{}[~]€ÆæßÉ!¡/\"#¤%&'()*+,-.|:;<=>?¿


We recommend substituting accents and other characters for the GSM alphabet equivalents. If you want to send messages with other characters, accents or emoticons, you need to send Unicode SMS (More information in Types of SMS messages).