What Is a Message Segment?
SMS segments are the blocks of characters (letters, numbers, spaces, punctuation, etc) that an individual SMS message is broken into. Segments are usually 160 characters for the GSM-7 format and 70 characters for the UCS-2 format. GSM-7 is the standard format, but UCS-2 is almost always used if your message contains emojis.
Messages over the character limit will be sent in multiple segments.
These rules are set by wireless carriers, not TextSpot.
Messages with multiple segments will incur additional credit costs.
See also: How do credits work?