Yes, we do. each english sms is(160 GSM char )or( 70 Unicode char) for the unicode lang,. Mobile handset uses SMS segmentation info, to reconnect the sms message correctly.
Take note that not always the 160 characters can be writen into a one text sms. Some special char from the GSM alphabet like £ sign need 2 char, – need an ‘escape’ char, + a char,. Such ‘escape’ char also considered when need to split the message into segments.