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How many characters can I send in a voice call?

For voice calls (Text to speech), we charge depending on the number of characters you send. For example, if you send up to 300 characters, we'll only charge you for 1 message. If you send 301 characters, we'll charge you for 2 messages, but will send it as a single voice call.

If a message is longer than 4 message parts, it will be truncated. 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. (https://en.wikipedia.org/wiki/GSM_03.38).

Character Count

A message can be classified as 2 types:

  • Standard message - contains characters from the GSM Basic Character Set (see 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. ( https://en.wikipedia.org/wiki/GSM_03.38).

Standard English Characters:

1 – 300 characters = 1 Message
301 – 600 characters = 2 Messages
601 – 900 characters = 3 Messages
901 – 1200 characters = 4 Messages 

Non-GSM (Unicode) characters:

1 – 150 characters = 1 Message
151 – 300 characters = 2 Messages
301 – 450 characters = 3 Messages
451 – 600 characters = 4 Messages 

GSM Basic Character Set

Reference: https://en.wikipedia.org/wiki/GSM_03.38

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


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