What Are the Limitations on SMS Messages?

European SMS

SMSs in English:

• GSM-7 characters are used for counting.
• If an SMS contains 160 characters or less, it is counted as one SMS.

  If an SMS contains more than 160 characters, every 153 characters are counted as one SMS.

• If an SMS contains 158 English characters, it is counted as one SMS. If an SMS contains 164 (153 + 11) characters, it is counted as two SMSs. If an SMS contains 320 (153 + 153 + 14) characters, it is counted as three SMSs.
• For example, if an SMS template contains variable ${NUM_8} set to 123456, that variable is counted as six characters.

SMSs in other languages:

• Each Unicode character, such as a letter, digit, punctuation (full-width and half-width), and space, is counted as one character.
• If an SMS contains 70 characters or less, it is counted as one SMS.

  If an SMS contains more than 70 characters, every 67 characters are counted as one SMS.