There are 2 kinds of SMS:

  • Standard message - contains only characters from the GSM Basic Character Set (see table below)
  • Unicode message - If a message contains any characters that aren’t in the GSM 03.38 basic character set, the message type will be treated as unicode.

 

Long Messages

A standard SMS message has a maximum of 160 characters including spaces, carriage returns, line feeds etc.

It is possible to send longer messages, however please be aware that exceeding 160 characters will constitute a ‘second’ message.

The end user will see this as 1 long (concatenated) message on their handset.

 

When a message is longer than 160 characters, this is referred to as a multi-part message as it contains multiple messages (or multiple-parts).

The total SMS limit then becomes 153 characters per message-part as the phone requires 7 characters to tell it that a message-part is part 1 of 2, part 2 of 2 etc.


Standard English Characters:

  • 1 – 160 characters = 1 Message
  • 161 – 306 characters = 2 Messages
  • 307 – 459 characters = 3 Messages
  • 460 – 612 characters = 4 Messages
  • 613 – 765 characters = 5 Messages
  • 766 – 918 characters = 6 Messages
  • 919 – 1071 characters = 7 Messages
  • 1072 – 1224 characters = 8 Messages

 

Non-GSM (Unicode) characters:

  • 1 – 70 characters = 1 Message
  • 71 – 134 characters = 2 Messages
  • 135 – 201 characters = 3 Messages
  • 202 – 268 characters = 4 Messages
  • 269 – 335 characters = 5 Messages
  • 336 – 402 characters = 6 Messages
  • 403 – 469 characters = 7 Messages
  • 470 – 536 characters = 8 Messages


GSM Basic Character Set

Note: Line breaks/carriage returns count as 2 characters.

GSM 7 character set

GSM Extended Character set

The following characters are also available, but they are counted as two characters in the SMS message rather than one:

| , ^ , € , { , } , [ , ] , ~ , \

 

Do spaces count as characters?

Yes, spaces do count as characters.