The length of a standard SMS is 160 characters. WinSMS supports long SMS messages of up to 918 characters (taking into account the symbols that count as 2 characters. For more information on symbols that count as 2 characters, click here.). This is equivalent to 6 concatenated messages in total.
1 – 160 = 1st SMS segment.
161 - 306 = 2nd SMS segment.
307 - 459 = 3rd SMS segment.
460 - 612 = 4th SMS segment.
613 - 765 = 5th SMS segment.
766 - 918 = 6th SMS segment.