This is the message body the text message. There is a limitation to 160 characters per SMS message.
All GSM handsets and network elements support the GSM 7-bit alphabet. The basic GSM charset contains the letters A to Z (uppercase and lowercase), numbers, special symbols and several symbols from the Greek alphabet.
The GSM charset uses 7-bit alphabet encoding, but the escape characters require 14 bits to encode, thus taking up two characters. These symbols are: |, ^, {, }, €, [, ~, ] and .
When your message contains even one character that is not included in the GSM 7-bit alphabet (for example š, ž, –, ´, “), then the message is sent in the 8-bit data encoding. This includes nearly all messages in non-English and non-Western-European languages.
The length of one message is 70 characters for an 8-bit SMS instead of the 160 characters for a 7-bit SMS.